[RFA/C] IRIX 6.5 with GCC build fixes

[Andrew Cagney]

Andrew Cagney wrote:

> Mon May  8 14:49:51 2000  Andrew Cagney  <cagney@b1.cygnus.com>
> 
>         From Michael Paddon <mmpp@esec.com.au>:
>         * configure.in (AC_CHECK_HEADERS): Check for <sys/user.h>.
>         * configure: Re-generate.
>         * proc-api.c: Only include <sys/user.h> when available.
>         (ioctl_table): Check that PIOCGETPR and PIOCGETU are defined.
> 
>         * TODO, README: Update.  Mention that GDB 5 needs GCC on IRIX.

FYI,

I've checked this into the 5.0 branch.  I'll hold off on the trunk until
after I've sorted out a few other IRIX problems.

GDB 5.0 should build on an IRIX 6.5 machine using GCC.

	Andrew