[Libguestfs] Add detection of AlmaLinux and CloudLinux

Automatic detection of the distribution doesn't work for AlmaLinux and CloudLinux, so for building you have to specify --with-distro = REDHAT.    https://bugzilla.redhat.com/show_bug.cgi?id=2001636   diff guestfs-appliance.m4 libguestfs/m4/guestfs-appliance.m4 108c108 <                     [FEDORA | RHEL | CENTOS],[DISTRO=REDHAT], ---     -- Aleksandr Kravchenko