Add NetBSD

[0323pin]

Now that #159 is fixed, please consider adding NetBSD installation to the README.md

Thanks!

[sharkdp]

Thank you

[0323pin]

I've added a TOOL_DEPENDS, i.e. forced the build to depend on go-md2man to generate the manpage during build-time.

The hexyl package itself does not have a dependency on go-md2man but, the build depends on it. This way, I won't miss a manpage update.

Now, I wonder ... is it possible to fix the WARNING: go-md2man does not handle node type HTMLBlock

It doesn't really bother me but, it would look cleaner during builds.

Cheers. Hopefully, this is solved now 😄

[sharkdp]

Now, I wonder ... is it possible to fix the WARNING: go-md2man does not handle node type HTMLBlock

I don't know. The man page is probably also outdated(?). If anyone wants to look into it - please go ahead.

[0323pin]

Alright, thanks!
I'll try to allocate sometime.