Add yield_prim_pthread_cancel_test

test/Jamfile.v2

@@ -390,6 +390,7 @@ run sp_thread_pause_test.cpp ;
 run sp_thread_yield_test.cpp ;
 run sp_thread_sleep_test.cpp ;
 run yield_prim_windows_h_test.cpp ;
+run yield_prim_pthread_cancel_test.cpp ;
 
 use-project /boost/core/swap : ./swap ;
 build-project ./swap ;