Include wx/math.h according to precompiled headers of wx/wx.h (with other minor cleaning).

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@39745 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/motif/bmpmotif.cpp

@@ -19,6 +19,10 @@
 
 #include "wx/motif/bmpmotif.h"
 
+#ifndef WX_PRECOMP
+    #include "wx/math.h"
+#endif
+
 #ifdef __VMS__
 #pragma message disable nosimpint
 #endif
@@ -33,8 +37,6 @@
     #include <X11/xpm.h>
 #endif
 
-#include "wx/math.h"
-
 Pixmap XCreateInsensitivePixmap( Display *display, Pixmap pixmap );
 
 static inline wxCharBuffer GetCacheImageName(WXImage image)