Warning fixes found under hardest mode of OpenWatcom. Seems clean in Borland, MinGW and DMC.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@29736 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/timer.cpp

@@ -150,7 +150,7 @@ wxTimerProc(HWND WXUNUSED(hwnd),
             UINT idTimer,
             DWORD WXUNUSED(dwTime))
 {
-    wxTimerMap::iterator node = g_timerMap.find(idTimer);
+    wxTimerMap::iterator node = g_timerMap.find((unsigned long)idTimer);
 
     wxCHECK_RET( node != g_timerMap.end(), wxT("bogus timer id in wxTimerProc") );