remove unused macro definitions

and limit others to the configurations which use them

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@76280 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/generic/grid.cpp

@@ -56,18 +56,6 @@
 
 const char wxGridNameStr[] = "grid";
 
-#if defined(__WXMOTIF__)
-    #define WXUNUSED_MOTIF(identifier)  WXUNUSED(identifier)
-#else
-    #define WXUNUSED_MOTIF(identifier)  identifier
-#endif
-
-#if defined(__WXGTK__)
-    #define WXUNUSED_GTK(identifier)    WXUNUSED(identifier)
-#else
-    #define WXUNUSED_GTK(identifier)    identifier
-#endif
-
 // Required for wxIs... functions
 #include <ctype.h>