In an used build path mruby-test wasn't updating mrbtest.c in the
case that the mgem selection was changed. This lead to:
- a missing reference in case a GEM was removed
- ignoring all new GEMs added to the build configuration
This fix keeps track of the active gems and demands a rebuild of
mrbtest.c in case that the gem selection changed.
This allows us to add `enable_test` anywhere in a build target,
without having to worry about the order in which they are included.
Previously, there was a bug that occured when adding 'mruby-test' gem
to dependencies before additional gems.
Instead of adding the 'mruby-test' gem dependency manually to a test build,
we now only need to call `enable_test` in the target. This also allows us to
call `test_enabled?` downstream when running mruby tests ourselves.
/cc #2924
YAMAMOTO Masaya