Log Message:
Update cpuflags to 0.42:
    - Add some additional x86 flags for gcc 3.x
    - Allow the path to cc to be specified as an argument to cpuflags
    - Use both the previous to handle the gcc3 package
    - Add an 'unsupported' optimize_gcc.mk which... to quote its comments:
       "This file is 'experimental' - which is doublespeak for unspeakably
	ugly, and probably quite broken by design.
	The intention is to pass additional flags to gcc to further optimise
	generated code. It _will_ make it impossible to debug, may fail to
	compile some code, and even generate curdled binaries. It is completely
	unsupported. Any questions should be directed to <abs@netbsd.org>.