- Add missing <sys/module.h>. - Use "envctrl" as the name when registering this module rather than "pcf";   we can't have "pcf" as the name for all pcf(4) front-ends or we would get   conflicts.
- Add missing <sys/module.h>.
- Use "envctrl" as the name when registering this module rather than "pcf";
  we can't have "pcf" as the name for all pcf(4) front-ends or we would get
  conflicts.

OK'ed by:	joerg

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