git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27788 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27760 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* configure.in: check ffs(). * missing/ffs.c: new file. * include/ruby/missing.h (ffs): declared. git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27759 b2dd03c8-39d4-4d8f-98ff-823fe69b080e