python3-setuptools: add _distutils_hack

I tried to install matplotlib by using pip and it failed with the following output:

2021-08-18T11:52:26,171 Collecting matplotlib
2021-08-18T11:52:26,173   Created temporary directory: /tmp/pip-unpack-wuth2u0e
2021-08-18T11:52:26,565   Using cached matplotlib-3.4.3.tar.gz (37.9 MB)
2021-08-18T11:52:38,659   Added matplotlib from https://files.pythonhosted.org/packages/21/37/           197e68df384ff694f78d687a49ad39f96c67b8d75718bc61503e1676b617/matplotlib-3.4.3.tar.                       gz#sha256=fc4f526dfdb31c9bd6b8ca06bf9fab663ca12f3ec9cdf4496fb44bc680140318 to build tracker '/tmp/pip-   req-tracker-u30x8pht'
2021-08-18T11:52:38,660     Running setup.py (path:/tmp/pip-install-afiyiers/                            matplotlib_8e717e38862f4976a3d6cb1832ba3261/setup.py) egg_info for package matplotlib
2021-08-18T11:52:38,661     Created temporary directory: /tmp/pip-pip-egg-info-kbtiezxq
2021-08-18T11:52:38,662     Running command python setup.py egg_info
2021-08-18T11:52:38,831     Traceback (most recent call last):
2021-08-18T11:52:38,832       File "<string>", line 1, in <module>
2021-08-18T11:52:38,832       File "/usr/lib/python3.9/site-packages/setuptools/__init__.py", line 8, in <module>
2021-08-18T11:52:38,833     ModuleNotFoundError: No module named '_distutils_hack'

More details about it:
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=968410

Once I applied the patch from the bug tracker, I got further to install
it.

Signed-off-by: Josef Schlehofer <pepe.schlehofer@gmail.com>

lang/python/python3-version.mk

@@ -12,7 +12,7 @@ PYTHON3_VERSION_MICRO:=6
 
 PYTHON3_VERSION:=$(PYTHON3_VERSION_MAJOR).$(PYTHON3_VERSION_MINOR)
 
-PYTHON3_SETUPTOOLS_PKG_RELEASE:=1
+PYTHON3_SETUPTOOLS_PKG_RELEASE:=2
 PYTHON3_PIP_PKG_RELEASE:=1
 
 PYTHON3_SETUPTOOLS_VERSION:=56.0.0

lang/python/python3/files/python3-package-setuptools.mk

@@ -20,6 +20,7 @@ define Py3Package/python3-setuptools/install
 	$(CP) \
 		$(PKG_BUILD_DIR)/install-setuptools/usr/lib/python$(PYTHON3_VERSION)/site-packages/setuptools \
 		$(PKG_BUILD_DIR)/install-setuptools/usr/lib/python$(PYTHON3_VERSION)/site-packages/setuptools-$(PYTHON3_SETUPTOOLS_VERSION).dist-info \
+		$(PKG_BUILD_DIR)/install-setuptools/usr/lib/python$(PYTHON3_VERSION)/site-packages/_distutils_hack \
 		$(1)/usr/lib/python$(PYTHON3_VERSION)/site-packages
 	find $(1)/usr/lib/python$(PYTHON3_VERSION)/site-packages/ -path '*/__pycache__/*' -delete
 	find $(1)/usr/lib/python$(PYTHON3_VERSION)/site-packages/ -type d -name __pycache__ -delete