Disable gcc warnings by adding pragmas and re-enable headersclean.

- IAxServerBase inherits IUnknown which does not have a virtual destructor.
- QAxFactory::metaObject(const QString &) hides QObject::metaObject()
  (false positive).

Task-number: QTBUG-45666
Change-Id: I8d1e69903ba6edde84ae9d4b64ee2e6088efad8b
Reviewed-by: Andy Shaw <andy.shaw@digia.com>

src/activeqt/axshared.prx

@@ -18,8 +18,6 @@ SOURCES = \
     shared/qaxtypefunctions.cpp \
     shared/qaxutils.cpp
 
-mingw: HEADERSCLEAN_EXCLUDE += shared/qaxtypefunctions.h shared/qaxtypes.h control/qaxfactory.h
-
 MODULE = axbase
 load(qt_module)
 QMAKE_DOCS_TARGETDIR =   # Make qt_docs.prf default to activeqt instead of qtaxbase

src/activeqt/control/qaxfactory.h

@@ -51,6 +51,8 @@ struct IUnknown;
 struct IDispatch;
 
 QT_BEGIN_NAMESPACE
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_GCC("-Woverloaded-virtual") // gcc complains about QObject::metaObject() being hidden.
 
 class QWidget;
 class QSettings;
@@ -288,6 +290,7 @@ public:
     } \
     QT_END_NAMESPACE
 
+QT_WARNING_POP
 QT_END_NAMESPACE
 
 #ifndef Q_COM_METATYPE_DECLARED

src/activeqt/shared/qaxtypefunctions.h

@@ -48,6 +48,8 @@
 #include <QtCore/qvariant.h>
 
 QT_BEGIN_NAMESPACE
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_GCC("-Wnon-virtual-dtor") // gcc complains about IAxServerBase inheriting IUnknown with non virtual destructor.
 
 extern GUID IID_IAxServerBase;
 struct IAxServerBase : public IUnknown
@@ -81,6 +83,7 @@ extern void clearVARIANT(VARIANT *var);
 #define QAX_INPROC_SERVER  (0x51540001)
 #define QAX_OUTPROC_SERVER (0x51540002)
 
+QT_WARNING_POP
 QT_END_NAMESPACE
 
 #endif // QAXTYPEFUNCTIONS_P_H