Tests: Fix compile for Qt5.6

Change-Id: Ie1e91135899353d81857b75d4e461a5a8cd240d4
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: David Schulz <david.schulz@qt.io>

tests/auto/environment/tst_environment.cpp

@@ -280,7 +280,7 @@ void tst_Environment::find()
     QCOMPARE((end != it), contains);
 
     if (contains)
-        QCOMPARE(it.value(), "bar");
+        QCOMPARE(it.value(), QString("bar"));
 
 }