Wholesale update of llmessage to V3.2

Note that this removes message logger for now.

indra/llcommon/llthread.cpp

@@ -434,6 +434,15 @@ void LLMutexBase::unlock()
 
 	apr_thread_mutex_unlock(mAPRMutexp);
 }
+
+bool LLMutexBase::isSelfLocked()
+{
+#if LL_DARWIN
+	return mLockingThread == LLThread::currentID();
+#else
+	return mLockingThread == local_thread_ID;
+#endif
+}
 	
 //----------------------------------------------------------------------------