common.mk: update "make help" so that "make check" now runs test-spec
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64505 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
common.mk: update "make help" so that "make check" now runs test-spec
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@64505 b2dd03c8-39d4-4d8f-98ff-823fe69b080e