build: Fix package auto-discovery (ref #468) (#608)

Commit 1fc63b5 tried to limit the
built packages to ignore other arbitrary top-level directories.  But
in turn, it disabled the auto-discovery in setuptools completely.
This results in build warnings for the missing sub-packages that would
have been auto-discovered.

Switch to an explicit setuptools.packages.find configuration which
still limits to the canopen top-level package.

Author: acolomb

pyproject.toml

@@ -35,8 +35,8 @@ db_export = [
 documentation = "https://canopen.readthedocs.io/en/stable/"
 repository = "https://github.com/canopen-python/canopen"
 
-[tool.setuptools]
-packages = ["canopen"]
+[tool.setuptools.packages.find]
+include = ["canopen", "canopen.*"]
 
 [tool.setuptools_scm]
 version_file = "canopen/_version.py"