Update the `apc.php` source link to point to the new gitweb
source instead of the former svn source.

(1): Set $_SERVER['PHP_SELF'] to a reasonable base URL for the page.
(2): Inject several variables into the global scope, since we are
     running apc.php by including it into another function.
(3): Run require_once directly instead of module_load_include() so that
     the global injection above continues to function.