Specify whether front- or back-facing polygons can be culled, default is back only

Property definitions

glesv2 :: glesv2 $ Sys :: glCullFace
# Specify whether front- or back-facing polygons can be culled, default is `back` only
fun glCullFace(mode: GLCullFaceMode) `{ glCullFace(mode); `}
lib/glesv2/glesv2.nit:1253,1--1254,60