Added a thread-safe and robust wrapper for APR pools.

See http://redmine.imprudenceviewer.org/issues/590
and https://jira.secondlife.com/browse/SNOW-596

indra/newview/llvoiceclient.cpp

@@ -1781,7 +1781,7 @@ void LLVoiceClient::stateMachine()
 
 				if(!mSocket)
 				{
-					mSocket = LLSocket::create(gAPRPoolp, LLSocket::STREAM_TCP);	
+					mSocket = LLSocket::create(LLSocket::STREAM_TCP);
 				}
 				
 				mConnected = mSocket->blockingConnect(mDaemonHost);