[libxml2] Fix a thread portability problem

[Daniel Veillard <veillard src gnome org>]

commit 3f6cfbd1d38d0634a2ddcb9a0a13e1b5a2195a5e
Author: Friedrich Haubensak <hsk fli-leibniz de>
Date:   Wed Sep 12 17:34:53 2012 +0200

    Fix a thread portability problem
    
    cannot compile libxml2-2.9.0 using studio 12.1 compiler on solaris 10
    
    I.M.O. structure initializer (as PTHREAD_ONCE_INIT) cannot be used in
    a structure assignment anyway

 threads.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/threads.c b/threads.c
index f206149..7e85a26 100644
--- a/threads.c
+++ b/threads.c
@@ -146,6 +146,7 @@ struct _xmlRMutex {
 static pthread_key_t globalkey;
 static pthread_t mainthread;
 static pthread_once_t once_control = PTHREAD_ONCE_INIT;
+static pthread_once_t once_control_init = PTHREAD_ONCE_INIT;
 static pthread_mutex_t global_init_lock = PTHREAD_MUTEX_INITIALIZER;
 #elif defined HAVE_WIN32_THREADS
 #if defined(HAVE_COMPILER_TLS)
@@ -915,7 +916,7 @@ xmlCleanupThreads(void)
 #ifdef HAVE_PTHREAD_H
     if ((libxml_is_threaded)  && (pthread_key_delete != NULL))
         pthread_key_delete(globalkey);
-    once_control = PTHREAD_ONCE_INIT;
+    once_control = once_control_init;
 #elif defined(HAVE_WIN32_THREADS) && !defined(HAVE_COMPILER_TLS) && (!defined(LIBXML_STATIC) || defined(LIBXML_STATIC_FOR_DLL))
     if (globalkey != TLS_OUT_OF_INDEXES) {
         xmlGlobalStateCleanupHelperParams *p;