for signal propagation tests
* lib/rake/file_utils.rb: Prefer the built ruby.
* test/rake/test_rake_functional.rb: ditto
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@38232 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
from RDoc.
* lib/rake/version.rb: Bump version to 0.9.2.1 to distinguish it from
the released version.
* NEWS: ditto
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32265 b2dd03c8-39d4-4d8f-98ff-823fe69b080e