Man pages symlinks are broken

1. The linked page is at .7 but symlink links to .1 - I didn't read these pages, so can't advise whether it should be in 1 or in 7
2. The Debian-specific override is not actually Debian-specific, and isn't limited to .gz - on Gentoo the compression method is configurable, but defaults to bz2

See https://github.com/gentoo/gentoo/pull/42687/files for a possible patch