TRUE/true, FALSE/false, whitespace cleaning.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@28812 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/msw/ole/dropsrc.h

@@ -16,9 +16,7 @@
     #pragma interface
 #endif
 
-#if !wxUSE_DRAG_AND_DROP
-  #error  "You should #define wxUSE_DRAG_AND_DROP to 1 to compile this file!"
-#endif  //WX_DRAG_DROP
+#if wxUSE_DRAG_AND_DROP
 
 // ----------------------------------------------------------------------------
 // forward declarations
@@ -80,4 +78,6 @@ private:
     DECLARE_NO_COPY_CLASS(wxDropSource)
 };
 
+#endif  //wxUSE_DRAG_AND_DROP
+
 #endif  //_WX_OLEDROPSRC_H