etc.c: try confstr on Mac OS X
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47826 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
etc.c: try confstr on Mac OS X
confstr() on Mac OS X.
c.f. http://www.opensource.apple.com/source/ruby/ruby-104/patches/ext_etc_etc.c.diff
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47826 b2dd03c8-39d4-4d8f-98ff-823fe69b080e