glibc: version bumped to 2.18.

For testing purposes only.
glibc: Small module cleanup, new security patches.

Removed systemd unit files for the time being because nscd currently
cause issues with add_priv_{user,group} if enabled. Until we have a
mechanism available in lunar to handle that we better leave it
disabled. What happens is that the nscd cache isn't updated quickly
enough after add_priv_{user,group} which cause issues for commands
depending on a user or group existing.

Also removed a few old fixes that no longer seems to be required.
glibc: added missing patch url for SOURCE13
glibc: removed the use of explicit 'exit 1'
glibc: missed a couple of &&
Merge branch 'glibc'