Setup WP-Skeleton to optimize the opcache

Recently I started converting several blogs over to the setup created by Mark Jaquith called WP-Skeleton. This means that the core of WordPress is located in a sub-directory in your blog directory. As I run multiple blogs on the same server, and the server runs an opcache, in my case I run PHP 5.5 but it could be any opcache, it would benefit the cache if all the blogs used the same directory.
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