Make the Windows qt_msectime() function return 64-bit

32-bit integers overflow after 49.7 days.

Task-number: QTBUG-43777
Change-Id: Ief8943bc86ba32e5a66b48604c583031af95ad42
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>

src/corelib/kernel/qeventdispatcher_win_p.h

@@ -58,7 +58,7 @@ class QEventDispatcherWin32Private;
 
 // forward declaration
 LRESULT QT_WIN_CALLBACK qt_internal_proc(HWND hwnd, UINT message, WPARAM wp, LPARAM lp);
-int qt_msectime();
+quint64 qt_msectime();
 
 class Q_CORE_EXPORT QEventDispatcherWin32 : public QAbstractEventDispatcher
 {

src/corelib/kernel/qeventdispatcher_winrt_p.h

@@ -52,7 +52,7 @@
 
 QT_BEGIN_NAMESPACE
 
-int qt_msectime();
+quint64 qt_msectime();
 
 class QEventDispatcherWinRTPrivate;
 

src/corelib/tools/qelapsedtimer_win.cpp

@@ -117,7 +117,7 @@ static quint64 getTickCount()
 #endif // Q_OS_WINRT
 }
 
-int qt_msectime()
+quint64 qt_msectime()
 {
     return ticksToNanoseconds(getTickCount()) / 1000000;
 }