ngircd: update to 28

ngircd: update to 28

Update to the latest upstream stable release.

Also expand test.sh beyond the single loose configtest grep: assert the
daemon binary, init script and default config are installed, that
--configtest exits cleanly on the shipped config, and that it rejects an
explicitly-passed missing config file (so the positive check is real).
The daemon is never started, which would hang under QEMU emulation.

Signed-off-by: Alexandru Ardelean <redacted>