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/osx/evtloop.h

@@ -23,7 +23,7 @@ class WXDLLIMPEXP_CORE wxModalEventLoop : public wxGUIEventLoop
 public:
     wxModalEventLoop(wxWindow *modalWindow);
     wxModalEventLoop(WXWindow modalNativeWindow);
-    
+
 #ifdef __WXOSX_COCOA__
     // skip wxGUIEventLoop to avoid missing Enter/Exit notifications
     virtual int Run() { return wxCFEventLoop::Run(); }