Log Message:
libretro-snes9x2010: Update to 20200518

Changes:
     * libretro: added granularity in SuperFX overclock -
       There doesn't seem to be any benefit of overclocking above 15 MHz
       (150%). The user should be allowed to be more precise with their
       overclock setting now.
     * Fix MMC reg for 64bit builds -
       Fixes a segmentation fault when playing large ROM games.
     * Fix MMC bank register bit 7 (FuSoYa) -
       Fixes the 64Mbit ExLoRom map.
     * ROM: fail if ROM is invalid -
       Fixes an issue whereby a non-SNES file would cause a segmentation
       fault.
       This may occur if the selected ROM is corrupt, or a file has an
       incorrect extension.
     * APU: remove unused SoundSync -
       Additionally modified the resampler to use buffer size as a
       parameter
       instead of the number of samples within the buffer. Previously, the
       buffer size was being changed to the number of samples, and then
       changed
       back within the resampler.
     * snes9x: add defines for unused multi-cart support -
       The compiler was already optimising these unused functions out. The
       libretro core can define SNES_SUPPORT_MULTI_CART 1 to re-enable
       support
       for multi-cart in the future.
     * snes9x: refactor defines and remove overscan -
       Out of bounds memory fix from
     * snes9x: APU: Fix buffer overrun -
       Additionally:
       This fixes linking with LTO.
       Disable audio if an error occurs in init instead of continuing and
       segfaulting.
     * snes9x: reduce APU buffer to 64ms -
       I believe this to be a more sane setting than a 1000ms buffer.
     * snes9x: backport config from upstream -
       Most options were not available in English, despite it being the
       default
       language. All the options that were available in Turkish are now
       available in English.
     * snes9x: fix headercount increment
     * libretro: fix pitch measurement