This may or may not actually work, and will certainly need a few
runs to build up the cache first.

Fixes at least an snprintf() issue on macOS, and likely many other
things.  It's actually surprising this builds without it to be honest.

Search in both /usr/local (Homebrew) and /opt/local (MacPorts) for
libraries.

Also, have the name of GNU make be an in option in CI so we can use
the Apple-provided make.

Now if you don't specify MIN_MAC_OSX_VERSION, it will use the
"current" version of macOS as the target.  "Current" is defined as
X.0 where the major version (X) is greater than 10 and X.Y when
major version is 10.

This allows building for a specific target, but uses the newest
libraries if you don't specify.

For Synchronet "stuff", we can trivially change this, but some work
needs to be done to enable Spidermonkey and Cryptlib to pick up the
chosen value.

JS should be fairly simple since it's a configure argument.  Cryptlib
is a bit trickier since it's in a patch.

Web browsers tend start a download and then immediately close the socket
(so now send_failed will be true), while on a secondary socket, do a range
download of the same file.

So log the range requests/completions and don't log successful file sends
when the send was terminated due to a send failure.

We still count very small (e.g. 2 byte) ranges as successful file transfers
and notify the uploader (of a partial download), so we should fix those
issues still. But at least now, there's a whole lot less "noise" created
from HTTP[S} file downloads via browser.

The file_t struct may not have the size of the file pre-poulated, so we needed
to call getfilesize() here.

... so the [web] HttpLogFile setting in sbbs.ini couldn't be set using this
dialog. Been broken all this time.

Fixes issue closing SyncTERM in curses mode on macOS.

Fixes issue reported from CCO BBS.

The native OS calls are ObjC, and the C/C++ APIs are being deprecated,
so we need something along these lines.  For now, I'm just moving the
path "stuff" in there since that's the bulk of the deprecation
warnings in building SyncTERM.

The issue was that the various semaphores and mutexes weren't being
initialized at all when sdl_initconio() wasn't called... so starting
the event thread and telling it to stop would access uncreated
semaphores and mutexes.

Split out the init, and be sure to call it before exiting.

1) Use static SDL since it's required by both conio and XPDev
2) Since the SDL thread will always run, any attempt to shut down
   the SDL thread calls exit(0).  Not exactly what we want to
   return, but at least this makes it not hang waiting for the
   impossible.

JSDoor only compiles one file that isn't shared with the sbbs3
target, so there's no need to build them all twice.

Should fix js test suite on darwin.

It builds and appears to run... not actually tested.

ircdcfg would not provide a valid irc.ini file

See merge request !426

Use the standard `extern char **environ' instead.
Fixes an issue with macOS.

Also, check that env is not NULL in js_init.

No real purpose to keeping the default min version at 10.9.

... much more still to do, I'm sure.

We need _CIOLIB_main on macOS... at least until the curses stuff works.

Eliminate some never-defined/used flags (copied from smb.html?)

Sorry Nightfox, this might break your scripts