nir: Add nir_lower_clip_disable.c to SCons build.

Fixes: fb2fe802f638 ("nir: add lowering pass for clip plane enabling")
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/3217
Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5741>
1 file changed