New port: emulators/pcem: PC-Compatible low-level emulator striving for accuracy

A very accurate (and not very fast) PC and PC-compatible emulator.
Support currently ranges from the original IBM PC to Socket 7 motherboards.
It also supports a wide range of peripherals, including Voodoo Graphics!

WWW: https://www.pcem-emulator.co.uk

PR: 237376
Submitted by: Salvador Pardinas <darkfm@vera.com.uy>
Reviewed by: tobik