Log Message:
www/ruby-unicorn: update to 5.4.0

unicorn 5.4.0 / 2017-12-23

Rack hijack support improves as the app code can capture and use
the Rack `env' privately without copying it (to avoid clobbering
by another client).  Thanks to Sam Saffron for reporting and
testing this new feature:

  \ 
https://bogomips.org/unicorn-public/CAAtdryPG3nLuyo0jxfYW1YHu1Q+ZpkLkd4KdWC8vA46B5haZxw@mail.gmail.com/T/

We also now support $DEBUG being set by the Rack app (instead of
relying on the "-d" CLI switch).  Thanks to James P Robinson Jr
for reporting this bug:

  https://bogomips.org/unicorn-public/D6324CB4.7BC3E%25james.robinson3@cigna.com/T/
  (Coincidentally, this fix will be irrelevant for Ruby 2.5
   which requires 'pp' by default)

There's a few minor test cleanups and documentation updates, too.

unicorn 5.3.1 / 2017-10-03

This release fixes an occasional GC problem introduced in v5.3.0
to reduce global variable overhead (commit 979ebcf91705709b)

Thanks to Xuanzhong Wei for the patch which lead to this release:

https://bogomips.org/unicorn-public/20171003182054.76392-1-azrlew@gmail.com/T/#u
https://bogomips.org/unicorn-public/20171003145718.30404-1-azrlew@gmail.com/T/#u

  Xuanzhong Wei (1):
        fix GC issue on rb_global_variable array