Fix remaining extension typehints
Summary:
A few more extensions take arrays where they should take either a varray or a darray. Safe because if we get dvarray-ness wrong, all we'll do is raise a notice.
```
hphp/test/zend/good/ext/spl/tests/spl_classes.php
hphp/test/zend/good/ext/spl/tests/spl_iterator_apply_error.php
hphp/test/zend/good/ext/spl/tests/spl_iterator_apply_error_001.php
hphp/test/zend/good/ext/spl/tests/SplFileObject_fputcsv.php
hphp/test/zend/good/ext/standard/tests/file/fputcsv.php
hphp/test/zend/good/ext/zlib/tests/bug60761.php
```
Reviewed By: ricklavoie
Differential Revision:
D21491941
fbshipit-source-id:
e37b2c89c888de7097627b24a8637159e11e5a59