Use SV_IsFrontFace to implement gl_FrontFacing on DX11.
Use SV_IsFrontFace to implement gl_FrontFacing on DX11.

TRAC #22426
Signed-off-by: Jamie Madill
Signed-off-by: Daniel Koch
Author: Nicolas Capens

git-svn-id: 2a1ef23f1c4b6a1dbccd5f9514022461535c55c0@1752 736b8ea6-26fd-11df-bfd4-992fa37f6226

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