Remove all trailing spaces

No real changes, just clean up sources by removing trailing spaces from
all the non-generated files.

This should hopefully avoid future commits mixing significant changes
with insignificant whitespace ones.

include/wx/qt/defs.h

@@ -12,6 +12,6 @@
 
 typedef class QWidget *WXWidget;
 
-#endif 
+#endif
 
 #endif /* _WX_QT_DEFS_H_ */