utilities: Cleanup unused memcpy defines

All refer to memcpy, and only memcpy_fast is used, so there's no point
keeping them.

Also remove the _memset16_unaligned function prototype since there's no
function definition for it.

common/include/Utilities/MemcpyFast.h

@@ -28,13 +28,3 @@ extern u8 memcmp_mmx(const void* src1, const void* src2, int cmpsize);
 #else
 #define memcmp_mmx memcmp
 #endif
-
-// Only used in the Windows version of memzero.h. But it's in Misc.cpp for some reason.
-void _memset16_unaligned( void* dest, u16 data, size_t size );
-
-#define memcpy_fast					memcpy
-#define memcpy_aligned(d,s,c)		memcpy(d,s,c)
-#define memcpy_const					memcpy
-#define memcpy_constA				memcpy
-#define memcpy_qwc_					memcpy
-#define memcpy_qwc(d,s,c)			memcpy(d,s,c*16)

common/include/Utilities/Threading.h

@@ -160,8 +160,7 @@ namespace Threading
 	// For use in spin/wait loops.
 	extern void SpinWait();
 	
-	// Use prior to committing data to another thread (internal memcpy_qwc does not use fencing,
+	// Use prior to committing data to another thread
-	// so that many memcpys can be issued in a row more efficiently)
 	extern void StoreFence();
 
 	// Optional implementation to enable hires thread/process scheduler for the operating system.

common/src/Utilities/AlignedMalloc.cpp

@@ -48,7 +48,7 @@ void* __fastcall pcsx2_aligned_realloc(void* handle, size_t size, size_t align)
 
 	if( handle != NULL )
 	{
-		memcpy_fast( newbuf, handle, size );
+		memcpy( newbuf, handle, size );
 		pcsx2_aligned_free(handle);
 	}
 	return newbuf;