relnotes: note some more userland removals

[mhorne]

Summary

There may still be a few things missing, so please point them out.

Rendered version available at:
https://people.freebsd.org/~mhorne/website/public/releases/13.0R/relnotes/

[jhb]

Previously Ed was consistent in suggesting "obsolete" to refer to old GPLv2 toolchain bits.

website/content/en/releases/13.0R/relnotes.adoc

160

Maybe be more explicit that this was only FreeBSD/i386 binaries? Something like "Removed userland support for executing FreeBSD/i386 a.out executables."

179

179–181

Would perhaps want a gitref for binutils being removed if you take my suggestion here?

198

[emaste]

Previously Ed was consistent in suggesting "obsolete" to refer to old GPLv2 toolchain bits.

I'd avoid "obsolete" if it would appear to be editorializing or hyperbole, but our last-GPLv2-version tools really were obsolete so I think it's fair.

website/content/en/releases/13.0R/relnotes.adoc

160

I would leave "executing" out, what about just "Removed userland support for FreeBSD/i386 a.out executables."

[jhb]

website/content/en/releases/13.0R/relnotes.adoc

160

Yeah, that works and avoids the need for a followup sentence I almost suggested about still being able to do it via chroot.

[mhorne]

Address review comments.

Add an entry for GPL dtc(1) removal.

[mhorne]

website/content/en/releases/13.0R/relnotes.adoc

179–181

Hopefully I got the right selection of commits covering this.

[jhb]

website/content/en/releases/13.0R/relnotes.adoc

179–181

As long as you have at least one binutils one you are probably fine. For entries I worked on, I did not try to exhaustively list all commits, e.g. for KTLS I think I chose one even though there were several followup changes for TLS 1.3, etc.