PHP warning after 5.3.3 -> 5.3.3_1 bump

[Morgan Wesström]

Upgraded lang/php from port revision 5.3.3 to 5.3.3_1 yesterday to
include the new native MySQL drivers. Now I get the following warning
every time a php script is executed:

PHP Warning:  Module 'zlib' already loaded in Unknown on line 0

Even a simple "php -v" displays this warning.

- I have rebuilt php and all ports depending on it.
- I have verified that extensions.ini doesn't contain duplicates.
- I have searched for any other references to zlib.

This isn't critical I guess, but annoying. Any suggestions on how to
solve this would be appreciated.

Regards
Morgan