Release 4.8.1

This minor release was made mainly to revert the --sbindir/--bindir commit which broke some distributions.

Changelog:

    * selinux: incluee stdio (Michael Vetter)
    * man: don't suggest making groupmems user-writeable (Michael Weiser)
    * Makefile: bail out on error in for loops (Wolfgang Bumiller)
    * Adding logging of SSH_ORIGINAL_COMMAND to nologin. ([email protected])
    * add new HOME_MODE login.defs option (Duncan Overbruck)
    * Add tty logging to useradd ([email protected])
    * Useradd: make non-executable shell check only a warning (Tomas Mraz)
    * Update Dutch translation (Frans-Spiesschaert)
    * user_busy: Do not mistake a regular user process for a namespaced one (Tomas Mraz)
    * Revert "Honor --sbindir and --bindir for binary installation" Patrick McLean)