static error handler method doesn't seem to work in PHP 4

The void_error_handler static method in the LDAPInterface class seems to cause problems with php 4 (specifically, I'm using 4.4.2).

PHP complains about the static keyword and triggers a fatal error.

This patch moves the error handler to a function outside the scope of the LDAPInterface class which was the best way I could come up with to make this work in php 4 and php 5. Strangely I can't find any real reference to solving this issue elsewhere on the net so I'd appreciate if anyone has another solution or information that static functions should work in php 4 somehow.