Qmake: Parse two AppMan specific variables

Effectively the same approach as for Android, but a bit more ugly
as we don't have necessarily access to the appman plugin headers
even at compile time.

Change-Id: I6d00e69b593470e059a16a1fcf6b57bdd550ae40
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/qmakeprojectmanager/qmakenodes.cpp

@@ -379,6 +379,12 @@ QVariant QmakeProFileNode::data(Core::Id role) const
     if (role == Android::Constants::AndroidTargets)
         return {};
 
+    // We can not use AppMan headers even at build time.
+    if (role == "AppmanPackageDir")
+        return singleVariableValue(Variable::AppmanPackageDir);
+    if (role == "AppmanManifest")
+        return singleVariableValue(Variable::AppmanManifest);
+
     if (role == Ios::Constants::IosTarget) {
         const TargetInformation info = targetInformation();
         if (info.valid)