sdl2.m4 serial 2
Upstream SDL-2.0.16 has a serial 2 of sdl2.m4. Port changes between upstream serial 1 and 2 to out fc-sdl2.m4.
Upstream SDL-2.0.16 has a serial 2 of sdl2.m4. Port changes between upstream serial 1 and 2 to out fc-sdl2.m4.