New port, databases/pecl-rrd1: Copied from databases/pecl-rrd, so that
databases/pecl-rrd can be updated to version 2.0.1. Separate ports are
needed because databases/pecl-rrd does not support php 5.6 and
databases/pecl-rrd1 does not support php 7.0 and 7.1.

PR: 219939
Submitted by: daniel@blodan.se (maintainer)