setup.py: add pyfaust.fdb subpackage to pyfaust (fixing whl pkg).

wrapper/python/setup.py.in

@@ -66,7 +66,7 @@ setup(
     version = version, # cf. header
     include_dirs = numpy.get_include(),
     ext_modules = cythonize(PyFaust, compiler_directives={'language_level': sys.version_info.major }),
-    packages = [ 'pyfaust', 'pyfaust.tests' ],
+    packages = ['pyfaust', 'pyfaust.tests', 'pyfaust.fdb'],
     url = 'https://faust.inria.fr',
     project_urls={
         "Bug Tracker": "https://gitlab.inria.fr/faustgrp/faust/-/issues",