Constify atom name strings

Changes MakeAtom to take a const char * and NameForAtom to return them,
since many callers pass pointers to constant strings stored in read-only
ELF sections.   Updates in-tree callers as necessary to clear const
mismatch warnings introduced by this change.

Signed-off-by: Alan Coopersmith <alan.coopersmith@sun.com>
Acked-by: Peter Hutterer <peter.hutterer@who-t.net>

dix/dispatch.c

@@ -901,7 +901,7 @@ ProcInternAtom(ClientPtr client)
 int
 ProcGetAtomName(ClientPtr client)
 {
-    char *str;
+    const char *str;
     xGetAtomNameReply reply;
     int len;
     REQUEST(xResourceReq);