mruby/mruby — pull request #644 by xxuejie (2012-12-19 01:39:16+00:00)
Title: Derive DISABLE_GEMS macro according to build configuration

This is a newer version of Pull Request #633.

To enable mrbgems, we have to change two values now:

1. set ENABLE_GEMS to true in Rakefile
2. comment out DISABLE_GEMS in include/mrbconf.h

And of course, we also need to modify the *GEMS.active* file.

This two flags here are doing the same thing, so why not derive one from the other? This commit uses the value of ENABLE_GEMS to determine if we need to define DISABLE_GEMS macro.