Non PCH fix by adding include of "wx/wxcrtvararg.h"

PCH: Precompiled Header
The problem happens when wxUSE_SPINCTRL=0

src/generic/numdlgg.cpp

@@ -35,6 +35,7 @@
     #include "wx/textctrl.h"
     #include "wx/intl.h"
     #include "wx/sizer.h"
+    #include "wx/wxcrtvararg.h"
 #endif
 
 #if wxUSE_STATLINE