Cleanup of ad84d9f (r77846)

Remove the unnecessary 'CodePair' struct from a header, make the huge
keySymTab array const, and don't compile it for platforms that don't
use it, it's only used by wxX11

include/wx/unix/utilsx11.h

@@ -30,13 +30,9 @@ typedef unsigned long WXKeySym;
 
 int wxCharCodeXToWX(WXKeySym keySym);
 WXKeySym wxCharCodeWXToX(int id);
+#ifdef __WXX11__
 int wxUnicodeCharXToWX(WXKeySym keySym);
-
-// Xlib keysym-unicode charactor pair
-struct CodePair {
-    unsigned int keySym;
-    int uniChar;
-};
+#endif
 
 class wxIconBundle;