* Since the 6.3.0 release, devel/py-packaging has been defined in the
"setup.cfg" as an unconditional dependency. However this leads to
problems if py-packaging is uninstalled but py-setuptools_scm
persists, then the missing port can no longer be built. [1]
Although py-setuptools_scm has a fallback to devel/py-setuptools when
py-packaging is absent this fallback code is not executed. This is
because py-setuptools, which checks the dependencies of
py-setuptools_scm upon invocation and terminates as soon as these are
not met.
Fix this issue by converting py-packaging into an optional dependency
for py-setuptools_scm so that the fallback code is really used if
py-packaging is absent. But keep the latter one in the RUN_DEPENDS in
order to continue to reflect the actual dependencies.
* Also add py-packaging to BUILD_DEPENDS as defined in "pyproject.toml"
although it's not strictly required to build the port. [2]
* Bump PORTREVISION due package change.
PR: 259981
Reported by: many [1], koobs [2]
Tested by: se, myself
ad7f115cdd