[MacRuby] #1453: Add YAML::ENGINE and friend methods

[MacRuby]

#1453: Add YAML::ENGINE and friend methods
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 Reporter:  mrada@…                 |       Owner:  lsansonetti@…        
     Type:  defect                  |      Status:  new                  
 Priority:  blocker                 |   Milestone:                       
Component:  MacRuby                 |    Keywords:                       
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 So that the patch in rubygems:

 https://github.com/Watson1978/MacRuby/commit/e87ec498d2d060fa1a47f5850f6add3eb594eb71

 Is not needed. If MacRuby could at least say that it's `ENGINE` is not
 syck, then we could avoid the need for that patch.

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Ticket URL: <http://www.macruby.org/trac/ticket/1453>
MacRuby <http://macruby.org/>