efl: Remove cserve2 support
Summary:
As cserve2 support has not worked (if ever) in a very long time, and
it's authors are gone, this series of patches removes cserve2 (and
thus cache2) from our codebase to remove cruft and reduce
maintainability of unused code.
Reviewers: raster, cedric, zmike, Hermet
Reviewed By: Hermet
Subscribers: reviewers, committers
Tags: efl
Maniphest Tasks: T7226
Differential Revision: https://phab.enlightenment.org/D6942