Log Message:
Update cpuflags to 0.64:
	- Do nothing on x86_64 (for now). Thanks to Wolfgang S. Rupprecht
	- Digital AlphaPC 164SX. Thanks to HATANO Hiromichi.
	- Intel Pentium/MMX & Unrecognised Athlon XP. Thanks to Kimmo Suominen
	- Mips update for gcc 3.1 and later. Thanks to Andreas Yankopolus
	- Handle converting flags for old gcc versions recursively. Most
	  excessive case would be using cpuflags on a k6-3 win gcc 2.89 which
	  would map -march=k6-3 -> -march=k6 -> -march=pentium -> -march=i486