[NEW PORT] games/libretro-fmsx: FMSX - MSX Emulator

[lbartoletti]

Summary

This is a libretro core for fMSX, one of the oldest MSX1/2/2+ Computers emulators.

New port for libretro API

PR: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=246120

libretro meta port will be updated in another review.

Test Plan

poudriere (11/12/HEAD i386/amd64, HEAD aarch64)
portlint (looks fine.)

[tcberner]