bug#20136: 25.0.50; [PATCH] Fix broken libpthread detection

[Paul Eggert <eggert@cs.ucla.edu>]

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Wolfgang Jenkner wrote:
> -D_THREAD_SAFE or other flags are not needed on FreeBSD (since 7,
> at least)

OK, thanks, FreeBSD 6 was end-of-lifed some time ago and I assume Darwin is 
similar so I installed the attached simplification.

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From 84c6c65cb46bb9190fdd098e06e2109cdc7507d9 Mon Sep 17 00:00:00 2001
From: Paul Eggert <eggert@cs.ucla.edu>
Date: Thu, 19 Mar 2015 18:33:59 -0700
Subject: [PATCH] * configure.ac (_THREAD_SAFE): Simplify (Bug#20136).

---
 ChangeLog    | 2 +-
 configure.ac | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index d268ba0..a79863a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -3,7 +3,7 @@
 	Better port of pthread usage to FreeBSD
 	* configure.ac (ac_func_list): Omit pthread_sigmask, since
 	we check for that ourselves rather than relying on gnulib.
-	(HAVE_PTHREAD, LIB_PTHREAD, _THREAD_SAFE): Port better to FreeBSD,
+	(HAVE_PTHREAD, LIB_PTHREAD): Port better to FreeBSD,
 	by also checking for pthread_create, pthread_self, pthread_sigmask.
 	Tighten the test for pthread_atfork while we're at it.
 	Fixes: bug#20136
diff --git a/configure.ac b/configure.ac
index 520816b1..40c8d2b 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2234,7 +2234,7 @@ if test "$ac_cv_header_pthread_h" && test "$opsys" != "mingw32"; then
       hpux* | sol*)
 	AC_DEFINE([_REENTRANT], 1,
 	  [Define to 1 if your system requires this in multithreaded code.]);;
-      aix4-2 | darwin | freebsd)
+      aix4-2)
 	AC_DEFINE([_THREAD_SAFE], 1,
 	  [Define to 1 if your system requires this in multithreaded code.]);;
     esac
-- 
2.1.0