Apply pthread_cancel_patch

winsup/cygwin/thread.h

@@ -332,6 +332,8 @@ private:
   static nativeMutex mutexInitializationLock;
 };
 
+#define WAIT_CANCELED   (WAIT_OBJECT_0 + 1)
+
 class pthread:public verifyable_object
 {
 public:
@@ -379,6 +381,8 @@ public:
   virtual void testcancel ();
   static void static_cancel_self ();
 
+  static DWORD cancelable_wait (HANDLE object, DWORD timeout, const bool do_cancel = true);
+
   virtual int setcancelstate (int state, int *oldstate);
   virtual int setcanceltype (int type, int *oldtype);