File zthread.patch of Package ZThread

--- include/zthread/Guard.OLD.h	2013-03-15 11:18:57.199693380 +0000
+++ include/zthread/Guard.h	2013-03-15 11:11:03.288978846 +0000
@@ -428,7 +428,7 @@
   template <class U, class V>
   Guard(Guard<U, V>& g) : LockHolder<LockType>(g) {
 
-    LockingPolicy::shareScope(*this, extract(g));
+    LockingPolicy::shareScope(*this, this->extract(g));
     
   }