games/libretro-*: Update libretro cores and fix path
Update cores and fix path.
Some users complain than cores are installed in libexec instead of lib where RetroArch looks. So emulators will work out of box.
PR: 246067
Submitted by: menelkir@itroll.org (maintainer)
Approved by: tcberner (mentor)
Differential Revision: https://reviews.freebsd.org/D24820