Update lessphp to 011afcca8e

Source:

* https://github.com/leafo/lessphp/blob/011afcca8e6f1000a6e789921ba805fa578271a3/lessc.inc.php

Changes:

* https://github.com/leafo/lessphp/compare/2cc77e3c7b...011afcca8e

Change-Id: Ic21b97e52ec99b8eef094a902ee346cf40a9f174