Utils: Collapse most of porting,h

Taking the Qt 6 branches, leaving some dummies until downstream
adapted.

Change-Id: Ib9b86568d73c341c8f740ba497c3cbfab830d8a1
Reviewed-by: Eike Ziller <eike.ziller@qt.io>
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>

src/libs/qmljs/qmljsdialect.cpp

@@ -221,9 +221,9 @@ QList<Dialect> Dialect::companionLanguages() const
     return langs;
 }
 
-Utils::QHashValueType qHash(const Dialect &o)
+size_t qHash(const Dialect &o)
 {
-    return Utils::QHashValueType(o.dialect());
+    return size_t(o.dialect());
 }
 
 QDebug operator << (QDebug &dbg, const Dialect &dialect)