setup: fix subpackages install

Windows ``pip install`` resulted in missing msgpack_ext folder scripts.
Package finder together with empty inits fixes it.

Part of #238

Author: DifferentialOrange

CHANGELOG.md

@@ -143,6 +143,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Update documentation index, quick start and guide pages (#67).
 
 ### Fixed
+- Package build (#238).
 
 ## 0.9.0 - 2022-06-20
 

setup.py

@@ -5,9 +5,9 @@
 import re
 
 try:
-    from setuptools import setup
+    from setuptools import setup, find_packages
 except ImportError:
-    from distutils.core import setup
+    from distutils.core import setup, find_packages
 
 # Extra commands for documentation management
 cmdclass = {}
@@ -70,7 +70,7 @@ def find_version(*file_paths):
 
 setup(
     name="tarantool",
-    packages=["tarantool"],
+    packages=find_packages("."),
     package_dir={"tarantool": "tarantool"},
     include_package_data=True,
     version=find_version('tarantool', '__init__.py'),