Add mimetype application/x-lmdb

Since it shares the *.mdb extension with msaccess,
added a tes file for msaccess, and gave a higher weight
to the msaccess glob for compatibility reasons (so that filename-only
matching of *.mdb still says msaccess).

Reference for the extensions: https://lmdb.readthedocs.io/en/release/
Reference for the magic: https://git.openldap.org/openldap/openldap/-/blob/mdb.master/libraries/liblmdb/mdb.c

Fixes: #168
1 job for work/dfaure/lmdb in 1 minute and 16 seconds (queued for 1 second)
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