Removes ZeroFrog's "optimized" memcpy and memcmp functions.

These were only compiled in on Windows and x86_32.
They provided "optimized" copies and compares based on blocksizes for the AMD Athlon and Duron CPU families.
The code was taken from something that AMD provides with a as-is license.
Just get rid of this crap.
Merge pull request #370 from Sonicadvance1/remove_specialized_memcmp

Removes ZeroFrog's "optimized" memcpy and memcmp functions.