directed tests: Enabled top-level uncategorized tests in HIT

Change-Id: If37cbd00244ebfa0e5bff8362820aa68aaa163f1

tests/src/hipEnvVar.cpp

@@ -20,6 +20,10 @@ OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 THE SOFTWARE.
 */
 
+/* HIT_START
+ * BUILD: %t %s test_common.cpp
+ * HIT_END
+ */
 
 #include <stdio.h>
 #include <stdlib.h>