I completely reworked these unmaintained ports. I turned mess into a
proper slave port as the differences from mame were few. Some notes:
* converted to GitHub (this saved messing with the double-zip /
dos2unix per file arrangement, no more post-extract target)
* got rid of patchlevel support accordingly
* got rid of DIST_SUBDIR accordingly
* Clang from FreeBSD 10 cannot build this! It fails will some kind of
signal. I did not test on FreeBSD 11 yet. For now, degrade the
ports to use GCC always. Note the makefiles were hardcoded to GCC.
I fixed the hardcoding so it uses environment but perhaps it's known
that mame/mess is now gcc-only
* Some options are no longer optional, e.g. BUILTIN_DEBUGGER, SDL2
These were made unconditional accordingly.
* mess is now a minimal slave port. There are some additions to mame
Makefile to support the slave.
* I used PORTDOCS and PORTEXAMPLE to simplify each pkg-plist
* DragonFly support still pending. This port discovered a bug in
GCC 5.1 release which has been fixed recently, so the base compiler
has to be upgraded before testing can resume.
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