Revert "Fix for issue #555. Avoid usage of anonymous functions for backwards...

Revert "Fix for issue #555. Avoid usage of anonymous functions for backwards compatibility with PHP versions prior to 5.3."

This reverts commit 55a8e255100c226c388192ee608d1cfa9ba72afb.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@3378 44740490-163a-0410-bde0-09ae8108e29a