Fix build on DragonFly BSD

[mneumann]

Also remove duplicate include. There is no netinet/ip_mroute.h and netinet/sctp.h on DragonFly.

[SeanTAllen]

Thank you for this @mneumann.

I see you are a dragonfly committer. Do you know if any infrastructure for dragonfly we could run CI on to avoid breakage?

[winksaville]

Should this line be:

#ifdef PLATFORM_IS_DRAGONFLY

Which is defined in common/platform.h ?

[mneumann]

@winksaville : thanks, I will fix this.

[mneumann]

@SeanTAllen CI would probably be a lot of work to setup properly. For Rust we had a CI for DragonFly, which was a docker file that cross compiles Rust on Linux, but due to lack of resources of the Rust project, this never went into "production". FreeBSD and DragonFly share a common ports collection, and if a new release fails to build, we at least notice it there.

The pony runtime seems to be pretty well done, so I doubt there will be very often situations where things break. But of course I also have the desire for CI :). What I could do is to setup a daily cron job (or hourly whatever) that takes the most recent commit from github and compiles it, and reports build failures.

[SeanTAllen]

@mneumann given lack of CI, that would be great. do you know if anyone has tried doing CI for dragonfly apps using something like qemu on TravisCI?

[SeanTAllen]

Also, thanks for the contribution @mneumann. Wonderful first contribution.

[SeanTAllen]

Unrelated to anything. Dragonfly is one of my two favorite Unixes out there today. I did the original port because I hoped to start using Pony on Dragonfly. Sadly, haven't had a chance yet. Thanks for getting this working again. I haven't had time to spin up and test very often.

[mneumann]

@SeanTAllen some time ago, I also did made pony work on DragonFly as I wanted to try it out, but my patch contained too much platform specific changes. It's good to see that you have done it the right way (e.g. PLATFORM_IS_BSD instead of PLATFORM_IS_FREEBSD everywhere). Sadly, I didn't had a chance either to use Pony much. But I am so happy that it builds just with a few lines of changes out of the box.