Prevent segfault on PHP 5.3.3 by disabling GC.
Merge pull request #309 from bantu/php5.3.3-coverage-segfault

Prevent segfault on PHP 5.3.3 by disabling GC.

* bantu/php5.3.3-coverage-segfault:
  Prevent segfault on PHP 5.3.3 by disabling GC.