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Replace direct direct file access with VFS routines

Added rpi3_64 to makefile

Assign map descriptors after ROM is loaded

Increase SRAM size

Moved the assignment of map.descriptors and map.num_descriptors
until after the ROM is loaded.  Since the descriptors are initialized as
part of loading the ROM, assigning these struct members prior to loading
the ROM meant that retroarch would never see any memory maps.  After
this change, I can see the maps in the retroarch log output, as
expected.

Increased SRAM size from 128KB to 512KB. This fixes a crash in the
Super Metroid Practice Hack when saving/loading state.

This reverts commit 988fa23d.

This reverts commit 75139261.

that don't support it)

Fix build with clang

-flto=auto is gcc specific and fails under clang

Fix msvc2005/msvc2010 builds

This reverts commit ddd8b710.

Add RPI4 64 + N2 + OGA Support

Add optional automatic frame skipping

This PR uses the `RETRO_ENVIRONMENT_SET_AUDIO_BUFFER_STATUS_CALLBACK`
environment to implement optional automatic frame skipping, based on
the implementation in snes9x2005.