mesa: Remove support for named parameters.

mesa: Remove support for named parameters.

These were only part of NV_fragment_program, so we can kill them.

The fact that PROGRAM_NAMED_PARAM appears in r200_vertprog.c is rather
comedic, but also demonstrates that people just spam the various types
of parameters everywhere because they're confusing.

Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Eric Anholt <eric@anholt.net>