Licenses dir is not configurable

[vt-alt]

In ALT Linux we don't have separate directory for licenses, so it's preferable to install licenses into docdir. But this is not configurable.

[vt-alt]

See for Arch ppl even delete LICENSE from install.yml
https://aur.archlinux.org/cgit/aur.git/tree/PKGBUILD?h=rinstall-git
Perhaps it's would be benefitable to make it skippable.