Log Message:
Update ircu to ircu-2.10.11.07

- Fix ./configure for changed options
- Move to SUBST_* framework
- Use SPECIAL_PERMS to set the correct permissions on ${PKG_SYSCONFDIR} so
  the user does not have to do it.

There are lots of bugfixes in this release as 2.10.11.04 was first released
around 20+ months ago.  Users should check the package Changelog or website
for further details.