Chore: Delete code for unsupported platforms

[n1ywb-1]

There's still quite a bit of code in here related to platforms we no longer support. Trimming the cruft would simplify maintenance and improve portability to future platforms. AFAIK we deprecated support for these platforms in ucblogo v6, and if anybody wants to resurrect support for them the code still exists in v5.

Therefor I propose the following

• Remove Mac OSX Carbon support (OSX Classic MacOS Environment, unsupported since 10.15 circa 2019) Remove obsolete Classic MacOS and Carbon code #205
• Remove code marked mac (Classic MacOS)
• Remove code marked ibm and TURBOC (MSDOS)
• Remove code marked __RZTC__ and __ZTC__ (THINK-C/MSDOS)
• Remove <sgtty.h> imports (Ancient Unix)
• Remove xlib graphics (Ancient Unix)
• Remove old win32 terminal
• Remove MSVC support _MSC_VER (replaced by GCC)
• Update autoconf
• Build and test on Linux
• Build and test on Win32
• Build and test on Mac OSX

DO NOT REMOVE WIN32 STUFF; we still depend on it.

Do we care about any other unixes? BSDs? Commercial distros?

How far back to we want to officially support these systems? 10 years? Just a guideline of course. We want to maximize our potential user base without wasting effort on obsolete systems better supported by ucblogo v5.

And of course I would like to add WASM but we'll be targeting Emscripten's POSIX API so it smells like another unix port.

Files to remove

	deleted:    mac-fontmod/include/wx/mac/carbon/fontdlg.h
	deleted:    mac-fontmod/include/wx/mac/carbon/private.h
	deleted:    mac-fontmod/include/wx/mac/fontdlg.h
	deleted:    mac-fontmod/src/mac/carbon/bfontdlg.cpp
	deleted:    mac-fontmod/src/mac/carbon/bfontdlgosx.mm
	deleted:    mac-fontmod/src/mac/carbon/fontdlg.cpp
	deleted:    mac-fontmod/src/mac/carbon/fontdlgosx.mm
	deleted:    macterm.c
	deleted:    macterm.h
	deleted:    win32trm.c
	deleted:    win32trm.h
	deleted:    xgraphics.c
	deleted:    xgraphics.h
	deleted:    ztcterm.c
	deleted:    ztcterm.h

[brianharvey]

Yes, DOS and MacOS Classic are frozen at 5.3. By all means, you can delete that code. (Although I was amazed at how late I was getting emails from people in eastern Europe still using the DOS version, which is why it lasted as long as it did.) I never cleaned out the code because of the First Law of Engineering. :)

[n1ywb-1]

If somebody wanted to restore DOS support I would recommend starting from the cleaned-up unix codebase and using a modern compiler (GCC-derivative or Open Watcom) on FreeDOS.

[n1ywb-1]

Well the windows build still depends on the WIN32 macro, so I'll take that off the list.

[jrincayc]

I do care about other active opensource operating systems such as FreeBSD. But the only ones I currently compile for are Linux, Mac, and Windows using wxWidgets, and Linux X11. Old mac and MSDOS are fine to get rid of so far as I am concerned.

(So I would like to keep wxWidgets and X11)

[jrincayc]

Getting rid of sgtty.h is also fine with me (FreeBSD removed it in 2008: https://cgit.freebsd.org/src/commit/include?id=4ab0b22f9694942df9b8a1559f2d5d001afbc07b )

[n1ywb-1]

@jrincayc I left X11 alone; FWIW I couldn't get it to build before or after my changes.

[jrincayc]

@jrincayc I left X11 alone; FWIW I couldn't get it to build before or after my changes.

I just tested it with:
./configure --enable-x11 --with-wx-config=no --prefix=/tmp/ucblogo

on Fedora release 41 and it built and ran (commit e62251f )

[n1ywb-1]

I'm glad I didn't break it. I'm on linux mint, which is debian based, which might account for the difference. I installed the dependencies, I think. NBD.