warn_unused_result attribute ignoring

[Timo Sirainen <tss at iki dot fi>]

If I understood correctly, newer glibcs have added warn_unused_result
attribute to several functions when compiling with -D_FORTIFY_SOURCE=2.

I think this is a good idea in general, except there are some cases
where I really don't care if the call succeeds or not. Traditionally
it's been possible to use

(void)chdir("/blah");

to disable such warnings in lint, but this doesn't work with gcc. How
about adding support for it?

Of course I could just as well do

if (chdir("/blah") < 0) ;

but that's kind of ugly and not self-explanatory.

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