Move duplicated thread_enable_cancel to CommonLibs

Change-Id: I1a479b59bdda01233273dfa919bd678edbe34708
diff --git a/CommonLibs/Threads.cpp b/CommonLibs/Threads.cpp
index 2988e12..c056d69 100644
--- a/CommonLibs/Threads.cpp
+++ b/CommonLibs/Threads.cpp
@@ -122,6 +122,12 @@
 	}
 }
 
+void thread_enable_cancel(bool cancel)
+{
+	cancel ? pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL) :
+		 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
+}
+
 void Thread::start(void *(*task)(void*), void *arg)
 {
 	assert(mThread==((pthread_t)0));