SDL_mixer: MSVC project: rebuilt libgme dlls from latest v0.6.3-SDL branch. (b706a)

SDL Commits
1

https://github.com/libsdl-org/SDL_mixer/commit/b706a69d35190c0a2be89b3bc2403d2187be7c7a

[Couldn't obtain the patch due to network issues; please check the above link instead.]