[cmf] update list of hphp builtins files

Test Plan:
cd pfff/data/php_stdlib
make update

note that 'make check' in the same directory highlight a few
errors in hphp builtin files:
https://phabricator.fb.com/P11537165

Reviewers: eletuchy, jwatzman, seanc

Reviewed By: seanc

Subscribers: ptarjan, seanc

Differential Revision: https://phabricator.fb.com/D1368824

Tasks: 4438639