Add some const.

git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@1714 ec53bebd-3082-4978-b11e-865c3cabbd6b

lib/roken/resolve.c

@@ -211,7 +211,7 @@ parse_reply(unsigned char *data, int len)
 
 
 struct dns_reply *
-dns_lookup(char *domain, char *type_name)
+dns_lookup(const char *domain, const char *type_name)
 {
     unsigned char reply[1024];
     int len;