berkeley-db: Build db_dump185 compatibility util

[trinitronx]

The --enable-dump185 Builds the db_dump185 utility, which can dump Berkeley DB 1.85 and 1.86 databases. MacOS and BSD variants such as FreeBSD still use this version in certain system files such as /private/etc/aliases.db /etc/pwd.db, /etc/spwd.db, /etc/login.conf.db and others.

See: https://docs.oracle.com/cd/E17275_01/html/programmer_reference/build_unix_conf.html#build_unix_conf

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[trinitronx]

Note: Just needs libdb-dev on Linux for db.h header file.