(#7298) require 'English' to provide $CHILD_STATUS in Ruby 1.9

This had been coming from 'cgi', but in Ruby 1.9, cgi no longer requires
English. Since we use $CHILD_STATUS when execing, we need to have it available,
so require it manually. This also provides the other named special globals,
should we choose to use them.

Paired-With: Josh Cooper