emulators/mame: Update to 0.259
- Update to 0.259 (https://www.mamedev.org/?p=529)
- Some Makefile maintenance: remove blank lines from targets; opt for verbose build, remove @ from commands
- Add MAME keymaps
- Prefer ${PREFIX}/share over ${MANPREFIX}
- Pull in an upstream commit to patch LLVM builds for 0.259 on FreeBSD
Changelog: https://www.mamedev.org/?p=529
PR: 274227
MFH: 2023Q4