add nfsclient/, nfs4client/, and rpc/ directories to the top Makefile's rule to build a cscope database.
add nfsclient/, nfs4client/, and rpc/ directories to the
top Makefile's rule to build a cscope database.

Submitted by:	cel@citi.umich.edu
Approved by:	alfred

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