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)

Log message:
libretro-snes9x: make this use c++11, since "ISO C++ 1998 does not support
long long".

Log message:
libretro-snes9x: add version 1.56.2.

Libretro is a simple but powerful development interface that allows for
the easy creation of emulators, games and multimedia applications that
can plug straight into any libretro-compatible frontend. This development
interface is open to others so that they can run these pluggable emulator
and game cores also in their own programs or devices.

Snes9x is an emulator for the Super Nintendo Entertainment System / Super
Famicom.  This package is derived from the master repository of Snes9x. It
has greater accuracy and worse performance than Snes9x 2005/2010. It has
a less strict approach to accuracy than bsnes and therefore doesn't run
problematic games like bsnes, but has much better performance.

This is the most up-to-date libretro snes9x core available, and is
recommended for netplay.