Makefile.in: cd to working directory
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55303 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Makefile.in: cd to working directory
cd to working directory first and check if the directory exists.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@55303 b2dd03c8-39d4-4d8f-98ff-823fe69b080e