[smoke] Adds valgrind make target (#1530)

This adds a new target `valgrind` to enable execution of a testcase
under valgrind control.

Only tested with a couple of simple examples: helloworld and some OMPT
test cases.

Author: jplehr

test/smoke/Makefile.rules

@@ -103,6 +103,8 @@ og11run: $(TESTNAME)_og11
 	$(OG11ENV) ./$(TESTNAME)_og11
 gpurun: $(TESTNAME)
 	$(AOMP)/bin/gpurun $(RUNENV) $(RUNPROF) ./$(TESTNAME) 2>&1 | tee [email protected]
+valgrind: $(TESTNAME)
+	valgrind $(RUNENV) $(RUNPROF) ./$(TESTNAME) 2>&1 | tee [email protected]
 
 # Just verify output
 verify: run