regexec.c: enable direct threaded VM
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53248 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
regexec.c: enable direct threaded VM
the default.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@53248 b2dd03c8-39d4-4d8f-98ff-823fe69b080e