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/qmljsimportdependencies.cpp

@@ -502,9 +502,9 @@ QString ImportKey::toString() const
     return res;
 }
 
-Utils::QHashValueType qHash(const ImportKey &info)
+size_t qHash(const ImportKey &info)
 {
-    Utils::QHashValueType res = ::qHash(info.type) ^
+    size_t res = ::qHash(info.type) ^
             ::qHash(info.majorVersion) ^ ::qHash(info.minorVersion);
     foreach (const QString &s, info.splitPath)
         res = res ^ ::qHash(s);