Log message:
Pullup ticket #4898 - requested by taca
devel/ruby-test-unit: build fix

Revisions pulled up:
- devel/ruby-test-unit/Makefile                                 1.22

---
   Module Name:    pkgsrc
   Committed By:   taca
   Date:           Fri Jan  1 16:14:46 UTC 2016

   Modified Files:
           pkgsrc/devel/ruby-test-unit: Makefile

   Log message:
   Do not depend on devel/ruby-power_assert with ruby23 since ruby23 bundled
   its own power_assert gem.