Remove support for IRIX

The IRIX port wasn’t really working anyway, and the code was
getting in the way of other changes (e.g., getaddrinfo fixes).
IRIX’s supplier dropped support for IRIX in 2013.
* admin/CPP-DEFINES:
* configure.ac (opsys):
* doc/lispref/os.texi (System Environment):
* etc/MACHINES, etc/PROBLEMS:
* lisp/find-dired.el (find-grep-options):
* lisp/lpr.el (lpr-lp-system):
* lisp/ls-lisp.el (ls-lisp-emulation):
* lisp/mail/rmail.el (rmail-spool-directory):
* lisp/net/net-utils.el (ping-program-options):
* lisp/progmodes/gud.el (gud-irix-p, gud-dbx-use-stopformat-p):
* lisp/progmodes/ps-mode.el (ps-mode-print-function):
* src/conf_post.h [IRIX6_5]:
* src/emacs.c (Vsystem_type):
* src/filelock.c (get_boot_time_1):
* src/process.c (process_send_signal):
* src/unexelf.c (unexec):
Omit IRIX-specific code and/or documentation.
* configure.ac (NON_GCC_TEST_OPTIONS, IRIX6_5, PREFER_VSUSP):
Remove.  All uses removed.
* etc/NEWS: Document the change.

1 files changed, 0 insertions, 2 deletions

diff --git a/admin/CPP-DEFINES b/admin/CPP-DEFINES
index 86f2fa5a414..9064053934b 100644
--- a/admin/CPP-DEFINES
+++ b/admin/CPP-DEFINES
@@ -13,7 +13,6 @@ CYGWIN		Compiling the Cygwin port.
 __CYGWIN__      Ditto
 GNU_LINUX
 HPUX
-IRIX6_5
 MSDOS           Compiling the MS-DOS port.
 __MSDOS__       Ditto.
 __DJGPP_MINOR__ Minor version number of the DJGPP library; used only in msdos.c and dosfns.c.
@@ -378,7 +377,6 @@ NSIG
 NSIG_MINIMUM
 NULL_DEVICE
 PAGESIZE
-PREFER_VSUSP
 PTY_ITERATION
 PTY_NAME_SPRINTF
 PTY_OPEN