i965: enable ARB_ES3_2_compatibility on gen8+

Note that ASTC support is not actually mandated for this extension to be
exposed.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Acked-by: Kenneth Graunke <kenneth@whitecape.org>

src/mesa/drivers/dri/i965/intel_extensions.c

@@ -400,6 +400,7 @@ intelInitExtensions(struct gl_context *ctx)
       ctx->Extensions.ARB_shader_precision = true;
       ctx->Extensions.ARB_gpu_shader_fp64 = true;
       ctx->Extensions.ARB_vertex_attrib_64bit = true;
+      ctx->Extensions.ARB_ES3_2_compatibility = true;
       ctx->Extensions.OES_geometry_shader = true;
       ctx->Extensions.OES_texture_cube_map_array = true;
    }