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.

Source/Core/VideoCommon/CMakeLists.txt

@@ -35,8 +35,7 @@ set(SRCS	BPFunctions.cpp
 			VideoConfig.cpp
 			VideoState.cpp
 			XFMemory.cpp
-			XFStructs.cpp
-			memcpy_amd.cpp)
+			XFStructs.cpp)
 set(LIBS core png)
 
 if(NOT _M_GENERIC)