Add uipc_sockbuf.c to standard files list; accidentally missed in earlier commit.
Add uipc_sockbuf.c to standard files list; accidentally missed in earlier
commit.

Spotted by:	tinderbox

jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase,jrobhoward/SCADAbase