[PATCH] Fix build failure with GCC 4.3

Gengetopt 2.22 fails to build with the upcoming GCC 4.3 compiler (to
be released before and carried in Fedora 9). This tiny little patch
fixes it: http://rishi.fedorapeople.org/gengetopt-2.22-gcc43.patch

I also noticed that you use deprecated headers like stdio.h, stdlib.h,
etc. instead of cstdio, cstdlib, etc.. Any particular reason? Or would
you like a patch to fix them?

Happy hacking,
Debarshi
-- 
"From what we get, we can make a living; what we give, however, makes a life."
    -- Arthur Ashe