add test

ext/standard/tests/strings/bug36944.phpt

@@ -0,0 +1,26 @@
+--TEST--
+fix #36944 (strncmp & strncasecmp do not return false on negative string length)
+--FILE--
+<?php
+
+var_dump(strncmp("test ", "e", -1));
+var_dump(strncmp("test ", "e", 10));
+var_dump(strncmp("test ", "e", 0));
+
+var_dump(strncasecmp("test ", "E", -1));
+var_dump(strncasecmp("test ", "E", 10));
+var_dump(strncasecmp("test ", "E", 0));
+
+echo "Done\n";
+?>
+--EXPECTF--	
+Warning: Length must be greater than or equal to 0 in %s on line %d
+bool(false)
+int(1)
+int(0)
+
+Warning: Length must be greater than or equal to 0 in %s on line %d
+bool(false)
+int(15)
+int(0)
+Done