Fix clip distance on gles host
When running GL 3.0 applications on a GLES host support emitting gl_ClipDistance might be required in the host. GLES exposes this with the extension EXT_feat_clip_cull_distance so require this if needed.
When running GL 3.0 applications on a GLES host support emitting gl_ClipDistance might be required in the host. GLES exposes this with the extension EXT_feat_clip_cull_distance so require this if needed.