Remove unnecessary #include that was making ports to some systems difficult.
Remove unnecessary #include that was making ports to some systems difficult.


git-svn-id: c3edda122e248ef33995da003806c930f62b9468@433 31904243-a364-42ac-a3db-9305396518ba

OpenImageIO/oiio,scott-wilson/oiio,lgritz/oiio,sambler/oiio,mcanthony/oiio,OpenImageIO/oiio,jeremyselan/oiio,YangYangTL/oiio,cwilling/oiio,micler/oiio,lgritz/oiio,YangYangTL/oiio,sambler/oiio,micler/oiio,mcanthony/oiio,lgritz/oiio,scott-wilson/oiio,scott-wilson/oiio,YangYangTL/oiio,YangYangTL/oiio,micler/oiio,cwilling/oiio,bdeluca/oiio,bdeluca/oiio,bdeluca/oiio,mcanthony/oiio,bdeluca/oiio,cwilling/oiio,sambler/oiio,mcanthony/oiio,scott-wilson/oiio,OpenImageIO/oiio,lgritz/oiio,micler/oiio,jeremyselan/oiio,jeremyselan/oiio,OpenImageIO/oiio,cwilling/oiio,sambler/oiio