Merge 84982,84983 from trunk. Fix #8754.

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  r84982 | jhunold | 2013-07-08 15:11:49 +0200 (Mo, 08 Jul 2013) | 1 line
  
  Fix: correct elif chain
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  r84983 | jhunold | 2013-07-08 15:12:18 +0200 (Mo, 08 Jul 2013) | 3 lines
  
  Fix #8754: Add support for upcoming msvc-12.0
  
  Thanks to Lars Viklund for the patch
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git-svn-id: http://svn.boost.org/svn/boost/branches/release@85166 b8fc166d-592f-0410-95f2-cb63ce0dd405