devel/p5-Hash-SharedMem: Add new port

This module provides a facility for efficiently sharing mutable
data between processes on one host. Data is organised as a
key/value store, resembling a Perl hash. The keys and values
are restricted to octet (Latin-1) strings. Structured objects
may be stored by serialising them using a mechanism such as
Sereal.

Approved by: hrs (mentor)