kgio provides non-blocking I/O methods for Ruby without raising
exceptions on EAGAIN and EINPROGRESS. It is intended for use with the
Unicorn and Rainbows! Rack servers, but may be used by other
applications.

* http://bogomips.org/kgio/
* kgio@librelist.org />* git://bogomips.org/kgio.git

Changes:

* connect.c: disable AI_NUMERICSERV

It's not needed since we already verify the service is a
numeric port. AI_NUMERICSERV is not available in older glibc
(<2.3.4) and probably other old systems.