common.mk: preserve rest fields of bundled_gems
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60246 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
common.mk: preserve rest fields of bundled_gems
names and versions, for more extensions.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60246 b2dd03c8-39d4-4d8f-98ff-823fe69b080e