Data files for the calendar program

These data files have been extracted from FreeBSD-CURRENT SVN rev. 366901
and are provided as a port to ease their ongoing maintenance and updates
independently from the FreeBSD release cycle.

In order to use these files the calendar program must include the location
populated by the port into its search path. The program in FreeBSD-CURRENT
has already been updated, the STABLE sources will receive the patch.

A port of the updated calendar program will be offered for use in FreeBSD
release versions if the data files from this port are to be used.

Approved by: imp
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D26883