New port: sysutils/mapdir

mapdir is a shell script utility, that can be used to map the
structure of directory trees. It is mainly used to verify the
consistency between different directory hierachies, which contain
the same files, as the report files generated by mapdir can
subsequently be passed to the diff utility.

WWW: https://www.olivermahmoudi.com/programming/mapping-dirs

PR: 233112
Submitted by: Oliver Mahmoudi <fbsd@olivermahmoudi.com>