Move disable-X11.inc before disable-xdg.inc for consistency with other
profiles.

Added on commit 73a6fce ("New profile: ssmtp (netblue30#5544)", 2022-12-21).

Replace all occurrences of `blacklist /tmp/.X11-unix` with
`include disable-X11.inc`, which blacklists more X11-related files.

Commands used to search and replace:

    $ git grep -Ilz '^blacklist /tmp/.X11-unix' -- \
      etc/profile*/*.profile | xargs -0 perl -0 -pi -e '\
        s/\nblacklist \/tmp\/.X11-unix\n/\n/; \
        s/(\ninclude disable-xdg.inc\n)/\ninclude disable-X11.inc$1/; \
        s/(\ninclude disable-[^Xx\n]+\n)(\n|# )/$1include disable-X11.inc\n$2/'

Note: The following files were also edited manually:

* etc/profile-a-l/erd.profile
* etc/profile-a-l/links-common.profile
* etc/profile-m-z/termshark.profile
* etc/profile-m-z/tmux.profile
* etc/profile-m-z/tshark.profile

Relates to netblue30#4462 netblue30#4854.