Make faceforward match the conformance test. TRAC #12252 The conformance test checks the dot product for >= 0. Signed-off-by: Nicolas Capens Signed-off-by: Daniel Koch Author: Andrew Lewycky git-svn-id: https://angleproject.googlecode.com/svn/trunk@276 736b8ea6-26fd-11df-bfd4-992fa37f6226