Fail the 'buildkernel' target if not even one of the specified kernel configuration files was found.
Fail the 'buildkernel' target if not even one of the specified kernel configuration
files was found.

Reviewed by:	obrien

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