Fixed renaming of internal functions

package.xml

@@ -49,6 +49,7 @@ Execute code in restricted environment (sandboxing).
     <file name="runkit_function_redefine.phpt" role="test" />
     <file name="runkit_function_remove.phpt" role="test" />
     <file name="runkit_function_rename.phpt" role="test" />
+    <file name="runkit_function_rename_redefine_add_remove.phpt" role="test" />
     <file name="runkit_import_class.inc" role="test" />
     <file name="runkit_import_class.phpt" role="test" />
     <file name="runkit_import_class_property.inc" role="test" />

runkit_functions.c

@@ -366,10 +366,8 @@ PHP_FUNCTION(runkit_function_rename)
 		RETURN_FALSE;
 	}
 
-	if (fe->type == ZEND_USER_FUNCTION) {
-		func = *fe;
-		PHP_RUNKIT_FUNCTION_ADD_REF(&func);
-	}
+	func = *fe;
+	PHP_RUNKIT_FUNCTION_ADD_REF(&func);
 
 	if (zend_hash_del(EG(function_table), sfunc, sfunc_len + 1) == FAILURE) {
 		php_error_docref(NULL TSRMLS_CC, E_WARNING, "Error removing reference to old function name %s()", sfunc);

tests/runkit_function_rename_redefine_add_remove.phpt

@@ -0,0 +1,22 @@
+--TEST--
+complex test for renaming, adding and removing with internal functions
+--SKIPIF--
+<?php if(!extension_loaded("runkit") || !RUNKIT_FEATURE_MANIPULATION) print "skip"; ?>
+--INI--
+error_reporting=E_ALL
+display_errors=on
+runkit.internal_override="1"
+--FILE--
+<?php
+runkit_function_rename('rand', 'oldRand');
+echo oldRand(), "\n";
+runkit_function_add('rand', '', 'return "a" . oldRand();');
+echo rand(), "\n";
+runkit_function_remove('rand');
+runkit_function_rename('oldRand', 'rand');
+echo rand(), "\n";
+?>
+--EXPECTF--
+%d
+a%d
+%d