configure.in: arch dependent header directory options
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39108 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: arch dependent header directory options
options to customize architecture dependent header directories.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@39108 b2dd03c8-39d4-4d8f-98ff-823fe69b080e