Log Message:
libretro-snes9x: Update to 1.58.

Changes:

Snes9x 1.58
- Move the LICENSE file to the base directory and use a stub
  in all the source files referring to it.
- Adjust Chou Aniki timing hack.
- Use 1-based numbering when displaying pressed keys.
- Hide controller port if disabled when displaying keys.
- Fix movie playback.

 libretro:
- Fix interlaced modes when overscan crop is enabled.
- Allow overriding -flto. (orbea)

Snes9x 1.57
- Various seta010 emulation fixes.                          (kps501)
- Pass blargg OAM tests with proper write behavior.         (BearOso)
- Prevent interlacing in BG modes 1-4.                      (BearOso)
- Corrected IRQ and NMI emulation to allow more games to
  work properly.                                            (BearOso, OV2)
- Use 1 instead of 0 for initial PPU left window coordinate,
  fixing garbage in left column of pixels in some games.    (turhope)
- Added interpolation option hack for DSP.                  (kps501, mudlord,
                                                            BearOso)
- Added sprite-tile limit disabling hack.                   (Tatsuya79)
- Added libretro's fast snapshot support.                   (OV2)
- Add overclocking hack that increases IPC                  (retrotalker)
- Fix controller initialization issues preventing some games
  from using multitap.                                      (retrotalker)
- Proper write behavior for register $2122.                 (BearOso)
- Fix transparency issue with Star Fox asteroids.           (redguy, BearOso)
- Increase SuperFX speed to more accurately represent
  hardware, and fix bugs with Stunt Race FX and Yoshi's
  Island.                                                   (BearOso)
- Resize viewport on state load.                            (retrotalker)
- Many fixes to variables not saved or saved incorrectly in
  save states.                                              (Dwedit)
- Pass decimal tests in blargg's math test ROMs.            (BearOso)
- Remove memory leak in loadzip.cpp.                        (bonimy)
- Fix screen size not reverting when overscan is turned on
  then off mid-frame.                                       (BearOso)

 libretro:
- Massive update of libretro code to latest downstream.     (fr500, kps501,
                                                            OV2, twinaphex,
                                                            BearOso,
                                                            hiddenasbestos,
                                                            m4xw, kxyxz,
                                                            claudiuslollarius)