Add a conditional to handle pragma message when MSVC is used

MSVC does not support the warning preprocessor directive. To ensure
compatibility across compilers, add a conditional check to instead use
pragma message with MSVC.

Change-Id: If380ebf8b2a5bb771dbbb374158e619ce1090e65
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>

tests/manual/corelib/itemmodels/qrangemodel/main.cpp

@@ -10,6 +10,8 @@
 #include <QtQml/QQmlContext>
 #include <QQuickWidget>
 #include <QQuickItem>
+#elif defined(Q_CC_MSVC)
+#pragma message "Building without Quick UI"
 #else
 #warning "Building without Quick UI"
 #endif