[NEW PORT] games/libretro-cap32: Caprice32 - Amstrad CPC Emulator

Caprice32 is an Amdstrad computers emulator core for libretro compatible emulators, such as games/retroarch.

PR: 246129
Submitted by: menelkir@itroll.org
Approved by: tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D24864