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/bitmap.h

@@ -29,7 +29,7 @@ public:
     wxBitmap(const char* const* bits);
     wxBitmap(const wxString &filename, wxBitmapType type = wxBITMAP_TYPE_XPM);
     wxBitmap(const wxImage& image, int depth = wxBITMAP_SCREEN_DEPTH, double scale = 1.0);
-    
+
     // Convert from wxIcon / wxCursor
     wxBitmap(const wxIcon& icon) { CopyFromIcon(icon); }
     explicit wxBitmap(const wxCursor& cursor);