GHA: stop deleting curl in non-native workflows

We do it in Cirrus CI, but for some platforms it's not possible to
delete it and tests work anyway.

The test runner also runs `..

GHA: stop deleting curl in non-native workflows

We do it in Cirrus CI, but for some platforms it's not possible to
delete it and tests work anyway.

The test runner also runs `../src/curl` by default, which is always the
one freshly built. The runner may also need the system curl to talk to
APIs when needed.

Also:
- stop setting `CURL` env. This isn't picked up by the runners,
and works out of the box anyway.
- quote an option just in case.

Follow-up to 90e644f944969bb11c6448bf50c6d441b5c0b1e6 #13583
Closes #13765

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GHA: bump actions/checkout from 4.1.4 to 4.1.6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.4 to 4.1.6.
- [Release notes](https://github.com/actions/checkout/re

GHA: bump actions/checkout from 4.1.4 to 4.1.6

Bumps [actions/checkout](https://github.com/actions/checkout) from 4.1.4 to 4.1.6.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/0ad4b8fadaa221de15dcec353f45205ec38ea70b...a5ac7e51b41094c92402da3b24376905380afc29)

---
updated-dependencies:
- dependency-name: actions/checkout
dependency-type: direct:production
update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Closes #13720

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GHA: pin dependencies

Closes #13712

GHA: add NetBSD, OpenBSD, FreeBSD/arm64 and OmniOS jobs

Add these jobs to GHA:
- NetBSD, cmake-unity, clang, OpenSSL, x86_64, with tests, w/o python,
no parallelism (was flaky some

GHA: add NetBSD, OpenBSD, FreeBSD/arm64 and OmniOS jobs

Add these jobs to GHA:
- NetBSD, cmake-unity, clang, OpenSSL, x86_64, with tests, w/o python,
no parallelism (was flaky sometimes)
- OpenBSD, cmake-unity, clang, LibreSSL, x86_64, with tests,
with python, -j8, TFTP results ignored due to #13623.
- FreeBSD, cmake-unity and autotools, clang, OpenSSL, arm64
(Tests disabled for arm64, because they are slow. It's available for
x86_64 with python, -j12.)
Configuration matches our existing Cirrus CI one.
- OmniOS, autotools, gcc, OpenSSL, x86_64, with tests, -j12.

All build with websockets and examples.

Closes #13583

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