* m/iris4d.h, m/iris5d.h: Don't use the --cckr CC switch if we're
using GCC.
(NEED_SIOCTL): Move this to...
* s/irix3-3.h (NEED_SIOCTL): ... here; apparently it's not
necessary in irix4-0.h.
* s/irix4-0.h: Remove declaration of getpty; apparently Irix 4.0
already declares this elsewhere.
(PTY_TTY_NAME_SPRINTF): #undef this before re-#defining it.
* m/ibmps2-aix.h, m/pfa50.h, s/hpux.h, s/isc2-2.h, s/linux.h,
s/sco4.h, s/usg5-4.h: Remove HAVE_RENAME; configure guesses that now.
* m/iris4d.h, m/iris5d.h: Don't use the --cckr CC switch if we're
using GCC.
* unexelfsgi.c: New file; like unexelf.c, but tolerates program
segments above BSS.
* m/iris5d.h: New file.
* s/irix5-0.h: New file.
* process.c [__sgi] (allocate_pty): Give up immediately if pty is
inaccessible.
