py-importlib-metadata build problem on 9.0-RC1

[Mike Pumford <mpumford%mudcovered.org.uk@localhost>]

Getting the following error from my pkgcomp NetBSD 9.0-RC1 package builds:

=> Checking file permissions in py37-importlib-metadata-1.2.0
warning: 
/pkg_comp/obj/pkgsrc/devel/py-importlib-metadata/default/.destdir/usr/pkg/lib/python3.7/site-packages/importlib_metadata/docs/changelog.rst: 
group-writable file.
error: 
/pkg_comp/obj/pkgsrc/devel/py-importlib-metadata/default/.destdir/usr/pkg/lib/python3.7/site-packages/importlib_metadata/docs/changelog.rst: 
world-writable file.
warning: 
/pkg_comp/obj/pkgsrc/devel/py-importlib-metadata/default/.destdir/usr/pkg/lib/python3.7/site-packages/importlib_metadata/docs/index.rst: 
group-writable file.
error: 
/pkg_comp/obj/pkgsrc/devel/py-importlib-metadata/default/.destdir/usr/pkg/lib/python3.7/site-packages/importlib_metadata/docs/index.rst: 
world-writable file.
warning: 
/pkg_comp/obj/pkgsrc/devel/py-importlib-metadata/default/.destdir/usr/pkg/lib/python3.7/site-packages/importlib_metadata/docs/using.rst: 
group-writable file.
error: 
/pkg_comp/obj/pkgsrc/devel/py-importlib-metadata/default/.destdir/usr/pkg/lib/python3.7/site-packages/importlib_metadata/docs/using.rst: 
world-writable file.
warning: 
/pkg_comp/obj/pkgsrc/devel/py-importlib-metadata/default/.destdir/usr/pkg/lib/python3.7/site-packages/importlib_metadata/tests/data/example-21.12-py3-none-any.whl: 
group-writable file.
error: 
/pkg_comp/obj/pkgsrc/devel/py-importlib-metadata/default/.destdir/usr/pkg/lib/python3.7/site-packages/importlib_metadata/tests/data/example-21.12-py3-none-any.whl: 
world-writable file.
warning: 
/pkg_comp/obj/pkgsrc/devel/py-importlib-metadata/default/.destdir/usr/pkg/lib/python3.7/site-packages/importlib_metadata/tests/data/example-21.12-py3.6.egg: 
group-writable file.
error: 
/pkg_comp/obj/pkgsrc/devel/py-importlib-metadata/default/.destdir/usr/pkg/lib/python3.7/site-packages/importlib_metadata/tests/data/example-21.12-py3.6.egg: 
world-writable file.
5 errors and 5 warnings.
*** Error code 1

Same package builds without warnings or errors on NetBSD 8.1-STABLE. 
Regression in NetBSD 9.0 or package problem?