bug#10552: Emacs build failure on GNU/Hurd i386 caused by signal

[Chong Yidong]

Rob Browning <rlb@defaultvalue.org> writes:

> (If possible, please preserve the 650976-forwarded address in any replies.)
>
> We've had a report of a build failure on GNU/Hurd when a long write is
> interrupted by a signal (since Emacs hasn't set SA_RESTART).
>
> One proposed solution is to add
>
>   #define POSIX_SIGNALS 1
>
> to src/s/gnu.h.
>
> See: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=650976

Thanks.  Committed to trunk.