chat/inspircd: Import version 2.0.27 from pkgsrc-wip.

Some assistance and feedback with packaging from the inspircd
maintainer, thanks.

InspIRCd is a modular Internet Relay Chat (IRC) server.

It was created from scratch to be stable, modern and lightweight.
It avoids a number of design flaws and performance issues that
plague other more established projects, such as UnrealIRCd, while
providing the same level of feature parity.

(nia)