[Bug 259981] devel/py-setuptools_scm: Fix incorrect *_DEPENDS, causing devel/py-pyparsing (and others) Fails to configure: The 'packaging>=20.0' distribution was not found

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=259981

Kai Knoblich <kai@FreeBSD.org> changed:

           What    |Removed                     |Added
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 Attachment #229940|                            |maintainer-approval+
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--- Comment #8 from Kai Knoblich <kai@FreeBSD.org> ---
Created attachment 229940
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=229940&action=edit
py-setuptools_scm-workaround-for-py-packaging-v1.patch

Hm, devel/py-setuptools_scm has a fallback (via "try ... except") in [1] when
devel/py-packaging is absent.  It's also the only location where
devel/py-packaging is (optionally) required at the moment.

However, this code is not executed because devel/py-setuptools, which checks
the dependencies upon invocation and terminates as soon as these are not met,
which leads then to the errors in comment #0.

Attached is a workaround which should remedy the issue by patching out
devel/py-packaging from "setup.cfg" but keep it in RUN_DEPENDS.

It also adds devel/py-packaging to BUILD_DEPENDS as defined in pyproject.toml
although it's not strictly required to build the port.

I'll leave this patch here for a few days for general testing and feedback.

QA:
~~~
- poudriere -> OK (12.2-RELEASE amd64 against all consumers)
- portmaster -> OK (using the scenario outlined in comment #5)
- "make test" -> OK

--
[1]
https://github.com/pypa/setuptools_scm/blob/v6.3.2/src/setuptools_scm/_version_cls.py

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