Fix linux kernel module breakage introduced in r215675, by including <sys/sysent.h>.
Fix linux kernel module breakage introduced in r215675, by including
<sys/sysent.h>.

Noticed by:	many
Pointy hat to:	netchild

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