Patch for bootstrap/12752

[Richard Sandiford]

This patch fixes boostrap on mips-sgi-irix6.5.  It started failing after
Phil's recent patch to genmultilib, which gave a new meaning to "=" in
MULTILIB_OSDIRNAMES.  Unfortunately, the irix6 makefile expects "="s to
be passed through as-is.

Since the new behaviour only applies if the first entry has an "=",
an easy fix is to put the default multilib first.  However, I'm not
installing this as obvious in case anyone knows of some unwanted
side-effect.

Tested on mips-sgi-irix6.5.  OK to install?

Richard


	* config/mips/t-iris6 (MULTILIB_OPTIONS): Put -mabi=n32 first.
	(MULTILIB_OSDIRNAMES): Reorder accordingly.

Index: config/mips/t-iris6
===================================================================
RCS file: /cvs/gcc/gcc/gcc/config/mips/t-iris6,v
retrieving revision 1.19
diff -u -d -p -F^\([(a-zA-Z0-9_]\|#define\) -r1.19 t-iris6
--- config/mips/t-iris6	17 Oct 2003 11:44:33 -0000	1.19
+++ config/mips/t-iris6	12 Nov 2003 20:57:00 -0000
@@ -1,9 +1,9 @@
 # ??? If no mabi=X option given, but a mipsX option is, then should deal
 # with that.
-MULTILIB_OPTIONS=mabi=32/mabi=n32/mabi=64
+MULTILIB_OPTIONS=mabi=n32/mabi=32/mabi=64
 MULTILIB_DIRNAMES=
 MULTILIB_MATCHES=
-MULTILIB_OSDIRNAMES=mabi=32 . mabi=64
+MULTILIB_OSDIRNAMES=. mabi=32 mabi=64
 
 LIBGCC = stmp-multilib
 INSTALL_LIBGCC = install-multilib