[cairo] Linker errors when enabling MMX support in pixman

[David Weiß]

> Hello David,
Hey,
> 
> Apparently you won't want to use MMX for pixman for MSVC x64 builds (it
> will work for x86/Win32 builds).  Use SSE2 instead.

Do the SSE2 instructions completely replace those optimized for MMX? I thought they may complement each other, thus we may encounter performance impacts if MMX support is not working.

> 
> With blessings.
Greetings,
David