mruby/mruby — pull request #1643 by take-cheeze (2014-01-05 12:16:33+00:00)
Title: Reduce unnecessary mrbgems full test rebuild.

The whole mrbgems test rebuild is only required when there is a changes to *mrbc(or libmruby_core)* although in current *mruby:master* whenever there is a changes to *mrbgems(or libmruby)* the whole mrbgems test is rebuilt.
This patch should reduce unnecessary test rebuilds.