Update source to SDL2 2.0.12

Edward Rudd

2020-05-02 03f8528315fa46c95991a34f3325d7b33ae5538c

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usr/bin/sdl2-config
usr/include/SDL2
usr/lib/*/*.a
usr/lib/*/*.la
usr/lib/*/*.so
usr/lib/*/pkgconfig/sdl2.pc
usr/lib/*/cmake/SDL2/sdl2-config.cmake
usr/lib/*/cmake/SDL2/sdl2-config-version.cmake
usr/share/aclocal/sdl2.m4