libwrap: store RD_GPU_ID

We need to know the gpu_id for cffdump and pgmdump, to do the right
thing for a3xx vs a2xx.
pgmdump: begin updating for a3xx and latest driver

The program-binary format has some changes in newer drivers, and also
some differences for a3xx vs a2xx.  Not yet attempting to disassemble
the new a3xx shader ISA, just updating the program-binary parsing to not
be confused by the new format.