`lrzsz-m4-0.12.20.tar.bz2` has been obtained by running `aclocal --install` with
`sys-devel/gettext-0.21.1` installed.

`gettext-0.19.8-runtime-m4.tar.xz` is simply extracted from
`gettext-0.19.8-rc1.tar.xz` (see `repack-gettext-m4`).