contint: Disable php-apc on gallium

Also cleaned up inconsistent whitespace from 803d066.

APC is routinely causing false-positives through various php fatal errors
on gallium because it can't keep up with the large number of changes to
files all the time. Caching probably doesn't gain that much anyway since
the files are recreated and changes after every build.

A few recent samples of these ludicrous errors:

- Fatal error: Class 'MediaWiki' not found in index.php
- Fatal error: Class 'Title' not found in languages/Language.php
- Fatal error: require(): Cannot redeclare class page in includes/AutoLoader.php
- Fatal error: Class 'UnlistedSpecialPage' not found in includes/specials/SpecialBlankpage.php

Change-Id: I7505ae0665f6f989a67b5580e4bf0f7fca464221