[PATCH] respect build CPPFLAGS

[Mike Frysinger]

On Monday, September 19, 2011 12:31:56 Mike Frysinger wrote:
> the configure script takes care of setting up CPPFLAGS from the user, but
> the glibc makefiles don't actually respect the result.  this patch passes
> along the values accordingly.

for a little background, some distros (like Debian, Ubuntu, Gentoo, and i'm 
sure others) enable _FORTIFY_SOURCE by default in their compilers.  the way to 
disable this is by using -U_FORTIFY_SOURCE:
	CPPFLAGS=-U_FORTIFY_SOURCE ./configure ...

i could see this also being used to do CPPFLAGS=-DNEBUG to turn off asserts in 
glibc, or CPPFLAGS=-D_FORTIFY_SOURCE to build glibc itself with fortification, 
or maybe something even crazier :).
-mike
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