i965: Remove vestiges of function call support from the old VS backend.

This never worked.  brwProgramStringNotify also explicitly rejects
programs that use CAL and RET.  So there's no need for this to exist.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
4 files changed