[gentoo-dev] update `strip-flags` to allow flags that disable stuff

[Mike Frysinger]

i was trying to debug xorg-x11 and the CFLAGS that were causing it to segfault 
on my box when i found the following CFLAGS got mangled because of 
`strip-flags`:
CFLAGS="-O2 -march=pentium4 -mno-mmx -mno-sse -mno-sse2 -pipe"
suddenly xorg-x11 was built with:
CFLAGS="-O2 -march=pentium4 -pipe"

now, considering `strip-flags` is intended to 'sanitize' CFLAGS of all the 
crazy crap people stick in it for the purpose of not *over* optimizing, it 
seems like when people want to *disable* a few optimizations, they should :)

so my proposal is that `strip-flags` will allow any flag that begins with 
'-mno-' or '-fno-' ... any objections ?
-mike

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