warn against K&R compiler in glibc 2.2

[Ulrich Drepper]

Andreas Jaeger <aj@suse.de> writes:

> We can at least check for gcc -traditional with:
> #if defined __GNUC__ && __STDC__
> # error "You need a ISO C conforming compiler to use the glibc headers"
> #endif

Hum, sounds OK.

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