Since `make deb-apparmor` already exists, use that for now instead of
changing what `make deb` does.

This fixes CI.

Added on commit 494b26d ("adding --enable-apparmor by default for make
deb - most Debian-based distros have apparmor enabled by default",
2022-06-03).

Kind of relates to netblue30#5154.

This reverts commit 1fb814e.

If distclean is not executed before copying the files on dist, then the
generated files inside src/ are included in the dist archive:

    $ ./configure >/dev/null && make distclean >/dev/null &&
      ./configure >/dev/null && make dist | grep 'Makefile$' | wc -l
    26

This happens because src/ is copied wholesale on dist (see DISTFILES).
Revert the commit to ensure that only the input files (such as the
"Makefile.in" files) are archived.

Related discussion:
netblue30#5154 (review)

Relates to netblue30#5142.

Relates to #5133 #5154.

This reverts commit b4d0b24.

This amends commit 56b86f8 ("Revert "Makefile.in: stop running
distclean on dist"", 2022-06-08) / PR #5182.  Since the revert, `make
dist` itself already runs `make distclean`.

This also means that it is no longer necessary to run ./configure (to
generate "Makefile" from "Makefile.in") before running
./contrib/fj-mkdeb.py.

Misc: This is not a clean revert.

Relates to #5154.

This amends commit 9a0fbbd ("mkdeb.sh.in: pass remaining arguments to
./configure", 2022-05-13) / PR #5154.

See also #5176.

Instead of using the first argument as the `EXTRA_VERSION` variable.
This should make the usage of mkdeb.sh less confusing, especially when
one is not trying to set the variable.

As for using `EXTRA_VERSION` (which is still optional with this commit),
make sure that it is set as an environment variable before caling
mkdeb.sh.  Example:

    env EXTRA_VERSION=-apparmor ./mkdeb.sh --enable-apparmor

See also commit 9a0fbbd ("mkdeb.sh.in: pass remaining arguments to
./configure", 2022-05-13) / PR netblue30#5154.

The "deb" target depends on the "dist" target, which creates an archive
from DISTFILES.

The arguments to ./configure are misleading, as they do not affect the
archive that is used by `make deb`.  That is the case because the
configure output files (config.mk and config.sh) are not copied into the
dist archive, only their input files (config.mk.in and config.sh.in).

In order to affect the .deb package, the configure arguments have to be
passed to mkdeb.sh, which then forwards them to ./configure itself.

Note: This does not apply to the rpm-based jobs, as `make rpms` uses the
files directly rather than using the dist archive.

Relates to netblue30#5154.

The official .deb package is always built with apparmor support, so use
`--enable-apparmor` in mkdeb.sh and remove the "deb-apparmor" target in
order to reduce redundancy.

Note that custom configure options may be specified by calling
./mkdeb.sh directly.

For example, to build the .deb package without apparmor support, instead
of running `make deb`, the following commands can be used:

    make dist
    ./mkdeb.sh --disable-apparmor

Also, change the `build_apparmor` GitLab CI job into
`build_no_apparmor`, which is intended to check that building without
apparmor still works.

Note: This commit makes the resulting .deb package not have an
"-apparmor" suffix (see `EXTRA_VERSION` in mkdeb.sh), to avoid
redundancy (as having apparmor support becomes the default).

Misc: This is a follow-up to netblue30#5654.

Relates to netblue30#5154 netblue30#5176 netblue30#5547.

For consistency with mkdeb.sh.

Note: The default arguments and support for argument overriding was
added to to mkrpm.sh on commit 3d97332 ("Add configure options when
building rpm (netblue30#3422)", 2020-05-19).

The support for appending arguments was added to mkdeb.sh on commit
9a0fbbd ("mkdeb.sh.in: pass remaining arguments to ./configure",
2022-05-13) / PR netblue30#5154.