Minor fixes to PHP5 test importer

Summary: * Exclude buggy test ext/gmp/tests/014.phpt
* Use __DIR__ instead of getcwd() in tests/security/open_basedir.inc
* Deal with having false passed to utf8Sanitize()
* Add more "other files"

Prep for PHP-5.6.0 test import

Reviewed By: @fredemmott

Differential Revision: D1556259
hh_ide.js - remove unneeded declare_file call

Summary: caller needs to hh_add_file before they can call hh_check anyways, so declare file has already been called.

Reviewed By: @jwatzman

Differential Revision: D1562022