sysutils/cpupdate: update to g20180323

In new version:

• fix comment in the startup script on "cpupdate_flags" defaults for rc.conf;
• catch up with recent changes of platomav/CPUMicrocodes: updated to MCE DB r62.
• removed patch that was integrated (auto load cpuctl.ko, compiler warning);
• fixed crash when no supported CPU found (*);

Reported by: Eitan Adler (*)