un-xfail 12658_thread-1.cc on non-linux platforms

[Geoffrey Keating]

As far as I can tell from the mailing list, this was xfailed because
of a linux libc bug, and it passes on Darwin for me.

Tested with 'make check-libstdc++-v3' on Darwin.

-- 
- Geoffrey Keating <geoffk@apple.com>

===File ~/patches/libstdc++-12658threadxfail.patch==========
2004-10-29  Geoffrey Keating  <geoffk@apple.com>

	* testsuite/22_locale/locale/cons/12658_thread-1.cc: Only xfail
	on Linux.

Index: testsuite/22_locale/locale/cons/12658_thread-1.cc
===================================================================
RCS file: /cvs/gcc/gcc/libstdc++-v3/testsuite/22_locale/locale/cons/12658_thread-1.cc,v
retrieving revision 1.2
diff -u -p -u -p -r1.2 12658_thread-1.cc
--- testsuite/22_locale/locale/cons/12658_thread-1.cc	14 Jul 2004 14:01:44 -0000	1.2
+++ testsuite/22_locale/locale/cons/12658_thread-1.cc	30 Oct 2004 00:52:10 -0000
@@ -22,7 +22,7 @@
 
 // 22.1.1.2 locale constructors and destructors [lib.locale.cons]
 
-// { dg-do run { xfail *-*-* } }
+// { dg-do run { xfail *-*-linux* } }
 
 #include <locale>
 #include <pthread.h>
============================================================