Log Message:
games/sdlpop: update to sdlpop-1.22

Changelog:

2021 July 5
=================
(version 1.22)

FIXED: The prince can now grab a ledge at the bottom right corner of
       a room with no room below.
	Details: https://forum.princed.org/viewtopic.php?p=30410#p30410
	Testcase: doc/replays-testcases/SNES-PC-set level 11.p1r
	See FIX_CORNER_GRAB in config.h .
FIXED: Don't allow killing a skeleton in cheat mode.
FIXED: Ctrl+S didn't mute music (except death music).
FIXED: A falling tile on the left side of a pillar could cause the
       blue stripe to be drawn over the pillar.
FIXED: The top of moving gates became glitched on levels using
       non-default palettes.
FIXED: The right edge of pressed drop buttons was black if a big
       pillar was next to them.
FIXED: Guards appeared in the current room when they fell into spikes
       in an adjacent room. (Example: original level 11, room 22.)
FIXED: Show an error message if a data file is missing.
FIXED: "Remember guard hp" for non-standard guards.
FIXED: Colored torches were not restored on quickload if you (quit
       and) restarted the game after quicksave.
DONE: Added command-line parameter "mute": Start the game with sound off.
FIXED: Fixed compiling with some features #undefined. (USE_TEXT,
       USE_LIGHTING, USE_MENU)
DONE: Hide references to various features if the game was compiled
       without them.
DONE: A scrollbar appears in the pause menu if scrolling is possible.
	It's not clickable yet, it just shows where you are in the list.
DONE: Added command-line parameter "playdemo": Make the demo level
       playable.
FIXED: Fixed the detection of Ctrl+L during the demo level.
FIXED: Create the screenshots directory in SDLPoP's directory, even
       if the current directory is something else.
	This is to match how the replay folder works.
FIXED: On Windows, use Unicode/UTF-8 for mkdir().
	So the replay and screenshots directories can be created
        within non-ASCII paths.
FIXED: After quickload, show the room where the prince is, even if
       the player moved the view away from it (with the H,J,U,N keys).
FIXED: After quickload, don't draw guard HP if a previously viewed
       room (with the H,J,U,N keys) had a guard but the current room
       doesn't have one.
DONE: Speed up music, sounds, and transitions during fast forwarding.
FIXED: Prevent the modifier remapping from accessing out-of-range rooms.
FIXED: Don't show the mirror image if the prince is not in the
       currently shown room.
DONE: Added a new cheat key: Ctrl+B: Go back to the room where the
      prince is. (Undo H,J,U,N.)
FIXED: Fixed the length of feather fall in fast-forward mode.
FIXED: Prevent torches from being randomly colored when an older
       replay is loaded.
FIXED: If the prince is fighting a guard, and the player does a
       quickload to a state where the prince is near the mouse,
       the prince would draw the sword.
DONE: Added options for changing speeds. They are detected from
       PRINCE.EXE. (Used in Hurry up Prince, for example.)
DONE: In the settings menu, allow using Page Up, Page Down, Home, End.
FIXED: Fixed graphical glitches with an opening gate:
	1. with a loose floor above and a wall above-right.
	2. with the top half of a big pillar above-right.
	See FIX_ABOVE_GATE in config.h .
FIXED: Validate mode crashed with the error "init_scaling:
       SDL_CreateTexture: Invalid renderer".
DONE: Rewrote all mentions of key combinations to the "Ctrl+A" style.
DONE: Marked which features of SDLPoP are not in the original game.
      (To prevent confusions like #197)
DONE: Allow Backspace and Ctrl+C during replay.
DONE: During playback, display the number of ticks since start, if
      the timer is shown (debug cheats: T).
FIXED: Fixed crashing when a MIDI music interrupted another one.
FIXED: Make it possible to go through a certain closed gate on level 11
       of Demo by Suave Prince.
	Details: https://forum.princed.org/viewtopic.php?p=32326#p32326
	Testcase: doc/replays-testcases/Demo by Suave Prince level 11.p1r
	See FIX_COLL_FLAGS in config.h .
FIXED: When the prince jumps up at the bottom of a big pillar split
       between two rooms, a part near the top of the screen disappears.
	Example: The top row in the first room of the original level 5.
	Details: See FIX_BIGPILLAR_JUMP_UP in config.h .
DONE: Added a debug cheat to quickload but keep the currently loaded
      level. (Shift+F9)
	Motivation: https://forum.princed.org/viewtopic.php?p=32556#p32556
FIXED: Fixed spiked/chomped/bumped guards teleporting into the wrong room.
       (if fixes are enabled)
	Details: https://github.com/NagyD/SDLPoP/pull/237
FIXED: Quicksave during feather fall mode. (if fixes are enabled)
	Details: https://github.com/NagyD/SDLPoP/pull/236
FIXED: Prevent the prince from entering a glitched room when he falls
       into a wall or he is revived near a wall.
	Details: doc/replays-testcases/Original level 2 falling into wall.txt
	Testcase: doc/replays-testcases/Original level 2 falling into wall.p1r
	See FIX_ENTERING_GLITCHED_ROOMS in config.h .
FIXED: Optimized OPL mixing (MIDI music).
	Details: https://github.com/NagyD/SDLPoP/pull/238
	"More importantly: when run on a Raspberry Pi Zero, the music went
        from unusable to perfect,"
FIXED: Fixed the prince sliding through closed gates when you are using
       the caped prince graphics.
	Details: See FIX_CAPED_PRINCE_SLIDING_THROUGH_GATE in config.h .
DONE: Added a compilation-time flag to disable all fixes for vanilla
      execution.
	Details: https://github.com/NagyD/SDLPoP/pull/239
FIXED: If the prince dies on level 14, don't return to the intro after
       the level was restarted.
	Details: See FIX_LEVEL_14_RESTARTING in config.h .
DONE: Waste an RNG cycle in loose_shake() to match DOS PoP.
DONE: In new replays, use deprecation_number = 2. On playback, waste
      the RNG cycle only if deprecation_number >= 2.
	Older replays have deprecation_number <= 1, and we don't waste
	the RNG cycle when playing them back.
DONE: When backing offscreen (to the left) from the first guard on
      level 7 (among others), simulate the glitch from DOS PoP, which
      causes the prince to fall through the floor.
	Details: See https://github.com/NagyD/SDLPoP/issues/229
FIXED: On Windows, use Unicode/UTF-8 for stat().
	So SDLPoP can load levels from mod folders when a replay file
	restarts the level or advances to the next level.
DONE: Added a more visible error message when a mod referenced by a
      replay file cannot be found in the mods folder.
DONE: Allow guard skill customizations in SDLPoP.ini.
DONE: Made FIX_DOORTOP_DISABLING_GUARD configurable.