Add conflicts with libpam-tmpdir

• Use of libpam-tmpdir leads to problems installing MariaDB[1][2][3]. A fix for the serious issues may not be available for next stable release.

• Services run by systemd don't benefit from libpam-tmpdir[4]. So it's effect is limited to PAM sessions opened with a terminal. Terminal access is mostly for debugging in FreedomBox and not a primary use case.

• Services are (or will be) protected with PrivateTmp=yes in case of services running on FreedomBox. This is better protection compared to what libpam-tmpdir offers.

Links:

1. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1022994

2. https://jira.mariadb.org/browse/MDEV-29910

3. mariadb-team/mariadb-server!23 (merged)

4. https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1022994#32

Signed-off-by: Sunil Mohan Adapa sunil@medhas.org