fixinc patch for Solaris 2.6

[Joe Buck]

> Attached is a patch for egcs 970910 so that it works on Solaris 2.6.
> This is essentially the same as the patch offered by Casper Dik in
> comp.unix.solaris for standard gcc and which has apparently found its
> way into the Solaris 2.x FAQ.  Don't ask me why it's needed ... I have
> no idea.

This is that issue that you may have seen messages from RMS and others
about: the definition of __STDC__ and what it should be.  We should make
sure that we understand all the issues.