configure.in: check USDT headers
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49759 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
configure.in: check USDT headers
headers are available too.
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@49759 b2dd03c8-39d4-4d8f-98ff-823fe69b080e