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/toolbar.h

@@ -95,9 +95,9 @@ public:
 protected:
     // common part of all ctors
     void Init();
-    
+
     void DoLayout();
-    
+
     void DoSetSize(int x, int y, int width, int height, int sizeFlags) wxOVERRIDE;
 
 #ifndef __WXOSX_IPHONE__