configure.in: libdir_basename for -rpath and -install_name
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39345 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: libdir_basename for -rpath and -install_name
are affected when libruby directory changes. [Bug #7874]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39345 b2dd03c8-39d4-4d8f-98ff-823fe69b080e