[gpm] Lots of fixes against gpm-2-dev

[Enrico Weigelt]

* Mike Frysinger <vapier@gentoo.org> wrote:

> > The problem is: glibc only defines struct ucred w/ _GNU_SOURCE set.
> > No other (probably more portable) symbol.
> 
> use autoconf's AC_USE_SYSTEM_EXTENSIONS

thx!

fixed it in my branch, seems to build fine.
please pull.


cu
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