Merge tag 'upstream/5.5.7'

Upstream version 5.5.7
Imported Upstream version 5.5.7
update patches for 5.5.7-1 release
update phpapi version
enable PHP opcache

This means being more specific in the directories we clean; hence
the changes to the $(RM) calls
don't depend on PHP 5.4 components

We have 5.5 in Wheezy now, while Wheezy has 5.4. Keep this build
self-contained to avoid issues
release 5.5.7-1
Imported Upstream version 5.5.9
Merge tag 'upstream/5.5.9'

Upstream version 5.5.9
release 5.5.9-1