[SUGGESTION] Change x86 march flag to "pentium3"

Look, we have the x86-64 build. This is for 64-bit processors and anyone using a modern system should be using this. We also have the x86 build. While this is still maintained it needs to be targetted at those who need it most: Athlon XP and Pentium 4 users. -march=pentium3 is the highest common denominator for these 2 processors and no across the board improvement will be had with any further instruction sets.

You are forgetting all the 32bit OS users on modern hardware - windblows xp 32bit is still in wide use and many Linux distros keep on stupidly recommending the 32bit version (I'm looking at you *buntu!) :-P.