Build wheel from sdist

Starting in version 0.5.0, the default behavior of `pypa/build` is to
first build the sdist, then to buil a wheel from the sdist, see:

    https://pypa-build.readthedocs.io/en/latest/changelog.html#id10

If you specify `-s -w`, both will be built from the local directory.
Since the sdist is the correct release artifact from which to build
wheels, the default behavior is preferred.

Author: FFY00

tox.ini

@@ -78,7 +78,7 @@ deps =
 commands =
     python -c "from pathlib import Path; \
                [x.unlink(missing_ok=True) for x in Path('{toxinidir}/dist').glob('*')]"
-    python -m build -s -w -o {toxinidir}/dist {toxinidir}
+    python -m build -o {toxinidir}/dist {toxinidir}
     twine check {toxinidir}/dist/*
 
 [testenv:release]