Wrap RunLoopModeTracker into Objective-C namespace

RunLoopModeTracker as one of Qt Cocoa classes was not wrapped
in namespace which limited its use in Objective-C single symbol space.

Change-Id: Ida2c62c6f543a3bf5107f28c78d27435bcb3470d
Reviewed-by: Jake Petroules <jake.petroules@qt.io>

src/corelib/kernel/qeventdispatcher_cf.mm

@@ -44,7 +44,6 @@
 #include <QtCore/qthread.h>
 #include <QtCore/private/qcoreapplication_p.h>
 #include <QtCore/private/qcore_unix_p.h>
-#include <QtCore/private/qcore_mac_p.h>
 #include <QtCore/private/qthread_p.h>
 
 #include <limits>
@@ -59,11 +58,13 @@
 
 QT_USE_NAMESPACE
 
-@interface RunLoopModeTracker : NSObject {
+@interface QT_MANGLE_NAMESPACE(RunLoopModeTracker) : NSObject {
     QStack<CFStringRef> m_runLoopModes;
 }
 @end
 
+QT_NAMESPACE_ALIAS_OBJC_CLASS(RunLoopModeTracker);
+
 @implementation RunLoopModeTracker
 
 - (id) init

src/corelib/kernel/qeventdispatcher_cf_p.h

@@ -90,14 +90,11 @@
 #include <QtCore/qabstracteventdispatcher.h>
 #include <QtCore/private/qtimerinfo_unix_p.h>
 #include <QtCore/private/qcfsocketnotifier_p.h>
+#include <QtCore/private/qcore_mac_p.h>
 #include <QtCore/qdebug.h>
 #include <CoreFoundation/CoreFoundation.h>
 
-#ifdef __OBJC__
-@class RunLoopModeTracker;
-#else
-typedef struct objc_object RunLoopModeTracker;
-#endif
+Q_FORWARD_DECLARE_OBJC_CLASS(QT_MANGLE_NAMESPACE(RunLoopModeTracker));
 
 QT_BEGIN_NAMESPACE
 
@@ -253,7 +250,7 @@ private:
     RunLoopSource<> m_postedEventsRunLoopSource;
     RunLoopObserver<> m_runLoopActivityObserver;
 
-    RunLoopModeTracker *m_runLoopModeTracker;
+    QT_MANGLE_NAMESPACE(RunLoopModeTracker) *m_runLoopModeTracker;
 
     QTimerInfoList m_timerInfoList;
     CFRunLoopTimerRef m_runLoopTimer;