fix PCH-less build after changing timer id type to WPARAM (closes #10901)

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@61074 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/private/timer.h

@@ -14,6 +14,7 @@
 #if wxUSE_TIMER
 
 #include "wx/private/timer.h"
+#include "wx/msw/wrapwin.h"     // for WPARAM
 
 class WXDLLIMPEXP_BASE wxMSWTimerImpl : public wxTimerImpl
 {
@@ -26,6 +27,8 @@ public:
     virtual bool IsRunning() const { return m_id != 0; }
 
 protected:
+    // this must be 64 bit under Win64 as WPARAM (storing timer ids) is 64 bit
+    // there and so the ids may possibly not fit in 32 bits
     WPARAM m_id;
 };