Check_MK Werk 6515: Dropped libmcrypt / php-mcrypt dependency

ID: 6515 Title: Dropped libmcrypt / php-mcrypt dependency Component: Site Management Level: 1 Class: New feature Version: 1.6.0i1 The libmcrypt library and the mcrypt php module is not necessary for Check_MK and it's major components. We drop it because it is the last dependency on RedHat distros that is fetched from the EPEL repositories. This means that we can now skip this step during initial installation and thus simplify the installation process on these systems a bit more. The only component left that uses libmcrypt is the fairly old NSCA receiver which is still shipped with Check_MK. We keep this component for the moment since it's used by several installations and we currently have no 1:1 replacement for it. In case you need to use NSCAs encryption, which is highly recommended when you use NSCA, you may have to install libmcrypt by hand to make it work.