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/plugins/projectexplorer/deployablefile.h

@@ -64,7 +64,7 @@ public:
     {
         return !(d1 == d2);
     }
-    friend PROJECTEXPLORER_EXPORT Utils::QHashValueType qHash(const DeployableFile &d);
+    friend PROJECTEXPLORER_EXPORT size_t qHash(const DeployableFile &d);
 
 private:
     Utils::FilePath m_localFilePath;