make Makefiles not depend on .qmake.super

sync with qmake. this is a no-op in qtc.

Change-Id: Id5158d7e272fdee4f4a041fb7c828295a0a86684
Reviewed-by: Joerg Bornemann <joerg.bornemann@digia.com>
(cherry picked from qtbase/d135a311a34e693d761a3607663b0879be9bbf65)

src/shared/proparser/qmakeevaluator.cpp

@@ -1212,7 +1212,7 @@ bool QMakeEvaluator::loadSpec()
     m_qmakespec = QDir::cleanPath(qmakespec);
 
     if (!m_superfile.isEmpty()
-        && evaluateFile(m_superfile, QMakeHandler::EvalConfigFile, LoadProOnly) != ReturnTrue) {
+        && evaluateFile(m_superfile, QMakeHandler::EvalConfigFile, LoadProOnly|LoadHidden) != ReturnTrue) {
         return false;
     }
     if (!loadSpecInternal())
@@ -1803,7 +1803,7 @@ QMakeEvaluator::VisitReturn QMakeEvaluator::evaluateFile(
         m_current = m_locationStack.pop();
         pro->deref();
 #ifdef PROEVALUATOR_FULL
-        if (ok == ReturnTrue) {
+        if (ok == ReturnTrue && !(flags & LoadHidden)) {
             ProStringList &iif = m_valuemapStack.first()[ProKey("QMAKE_INTERNAL_INCLUDED_FILES")];
             ProString ifn(fileName);
             if (!iif.contains(ifn))

src/shared/proparser/qmakeevaluator.h

@@ -108,7 +108,8 @@ public:
         LoadPreFiles = 1,
         LoadPostFiles = 2,
         LoadAll = LoadPreFiles|LoadPostFiles,
-        LoadSilent = 0x10
+        LoadSilent = 0x10,
+        LoadHidden = 0x20
     };
     Q_DECLARE_FLAGS(LoadFlags, LoadFlag)