merge revision(s) 53400: [Backport #13572]
* tool/mkconfig.rb (RbConfig): prefix SDKROOT to oldincludedir not includedir, the latter is outside the ruby installation. [ruby-core:72496] [Bug #11881]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@59222 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
merge revision(s) 53400: [Backport #13572]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@59222 b2dd03c8-39d4-4d8f-98ff-823fe69b080e