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This adds support for DragonFlyBSD.

Mention which operating systems are supported.

Rather than making certain checks for panelw dependant on the underlying operating system, actually use pkg-config's detection mechanism properly. This makes the checking for panelw much easier and broader for other OSes which might have either panelw or gnupanelw.

This adds support for NetBSD, using the following external dependencies: libuuid ncursesw There is no CI (yet) as enabling that on Cirrus-CI requires some work, so for now, these builds will be run manually before releases. The test suite will also need tweaking to be fully supported but the key tests are supported for now.

Enable CI builds for MaxcOS on CirrusCI.

This adds support for MacOS (Monteray onward, although should work on older MacOSes). The BSD wrapper for poll/ppoll has been lifted from the work the folks over at OpenSSH have done -- thanks!

Move the detection of UUID header files to be included portably. This will have no functional effect until MacOS detection is put in place.

Update got-{fetch,index,send}'s Makefile.am to include ratelimit.c for progress output.

endian.h is portably included on non-OpenBSD systems, so let that mechanism determine if it should be included or not.

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imsg_clear frees and closes resources allocated as part of enqueueing imsgs so it's a no-op after reads. discussed with and ok stsp@

As done elsewhere, d->namlen is not a portable field from readdir, therefore simualte this via the strlen of the directory name instead.