fix ripper prereq
cd
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58494 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
fix ripper prereq
build, and id.h was created in the build directory too. it has
to include the build directory, i.e., the current directory
before
cd
.git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@58494 b2dd03c8-39d4-4d8f-98ff-823fe69b080e