configure.in: unexpand_shvar
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39294 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: unexpand_shvar
unexpanding shell variables in it.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39294 b2dd03c8-39d4-4d8f-98ff-823fe69b080e