[libxml2] Fix weak pthread symbols after commit 4adb7677

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 5ffe2981b7d0547dd957a61ac6e1e3db829748d1
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Sun Mar 6 19:26:24 2022 +0100

    Fix weak pthread symbols after commit 4adb7677
    
    Add missing mutexattr symbols.

 threads.c | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)
---
diff --git a/threads.c b/threads.c
index 524bcb8d..c024ae60 100644
--- a/threads.c
+++ b/threads.c
@@ -46,19 +46,20 @@ static int libxml_is_threaded = -1;
 
 #define XML_PTHREAD_WEAK
 
-#pragma weak pthread_once
+#pragma weak pthread_equal
 #pragma weak pthread_getspecific
-#pragma weak pthread_setspecific
 #pragma weak pthread_key_create
 #pragma weak pthread_key_delete
-#pragma weak pthread_mutex_init
 #pragma weak pthread_mutex_destroy
+#pragma weak pthread_mutex_init
 #pragma weak pthread_mutex_lock
 #pragma weak pthread_mutex_unlock
-#pragma weak pthread_equal
+#pragma weak pthread_mutexattr_destroy
+#pragma weak pthread_mutexattr_init
+#pragma weak pthread_mutexattr_settype
+#pragma weak pthread_once
 #pragma weak pthread_self
-#pragma weak pthread_key_create
-#pragma weak pthread_key_delete
+#pragma weak pthread_setspecific
 
 #else /* __GNUC__, __GLIBC__, __linux__ */