Make this compile on Heimdal and MIT Kerberos 5

auth/kerb5.c

@@ -68,6 +68,12 @@
 static const char rcsid[] = "$Sudo$";
 #endif /* lint */
 
+#ifdef HAVE_HEIMDAL
+# define krb5_free_data_contents(c, d)	krb5_data_free(d)
+#else
+# define krb5_principal_get_realm(c, p)	(krb5_princ_realm(c, p)->data)
+#endif
+
 static int verify_krb_v5_tgt __P((krb5_context, krb5_ccache, char *));
 static struct _sudo_krb5_data {
     krb5_context	sudo_context;
@@ -301,7 +307,7 @@ verify_krb_v5_tgt(sudo_context, ccache, auth_name)
 			    NULL, NULL, NULL);
 cleanup:
     if (packet.data)
-	krb5_data_free(&packet);
+	krb5_free_data_contents(sudo_context, &packet);
     krb5_free_principal(sudo_context, princ);
 
     if (error)