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Fixed bug #1090 (SDL_BlitCopyOverlap() assumes memcpy() operates in o…
…rder) Even if we're blitting between two different surfaces their pixels might still overlap, because of SDL_CreateRGBSurfaceFrom(), so always use SDL_BlitCopy() and check for overlap in that function. When handling overlapping surfaces, don't assume that memcpy() iterates forward, instead use memmove() correctly, and provide a fallback implementation of SDL_memmove() that handles the different cases. Fixed a bug with SDL_memset() not completely filling lengths that aren't a multiple of 4. Optimized SDL_memcpy() a bit using the same technique as SDL_memset().
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