Revert "gnu: python-packaging: Update to 20.4."

This reverts commit 71b15b4874.

gnu/local.mk

@@ -1526,6 +1526,7 @@ dist_patch_DATA =						\
   %D%/packages/patches/python-mox3-python3.6-compat.patch	\
   %D%/packages/patches/python-testtools.patch			\
   %D%/packages/patches/python-onnx-use-system-googletest.patch	\
+  %D%/packages/patches/python-packaging-test-arch.patch		\
   %D%/packages/patches/python2-parameterized-docstring-test.patch	\
   %D%/packages/patches/python-paste-remove-timing-test.patch	\
   %D%/packages/patches/python-pycrypto-CVE-2013-7459.patch	\

gnu/packages/patches/python-packaging-test-arch.patch

@@ -0,0 +1,65 @@
+Fix tests that are "hard coded" to expect x86_64 output by mocking the platform interface.
+
+Submitted upstream:
+https://github.com/pypa/packaging/pull/176
+
+diff --git a/tests/test_tags.py b/tests/test_tags.py
+index 1eacf68..0a3f1b4 100644
+--- a/tests/test_tags.py
++++ b/tests/test_tags.py
+@@ -435,37 +435,43 @@ class TestManylinuxPlatform:
+         linux_platform = list(tags._linux_platforms(is_32bit=False))
+         assert linux_platform == ["linux_x86_64"]
+ 
+-    def test_linux_platforms_manylinux1(self, monkeypatch):
++    def test_linux_platforms_manylinux1(self, is_x86, monkeypatch):
+         monkeypatch.setattr(
+             tags, "_is_manylinux_compatible", lambda name, _: name == "manylinux1"
+         )
+-        if platform.system() != "Linux":
++        if platform.system() != "Linux" or not is_x86:
+             monkeypatch.setattr(distutils.util, "get_platform", lambda: "linux_x86_64")
++            monkeypatch.setattr(platform, "machine", lambda: "x86_64")
+         platforms = list(tags._linux_platforms(is_32bit=False))
+-        assert platforms == ["manylinux1_x86_64", "linux_x86_64"]
++        arch = platform.machine()
++        assert platforms == ["manylinux1_" + arch, "linux_" + arch]
+ 
+-    def test_linux_platforms_manylinux2010(self, monkeypatch):
++    def test_linux_platforms_manylinux2010(self, is_x86, monkeypatch):
+         monkeypatch.setattr(
+             tags, "_is_manylinux_compatible", lambda name, _: name == "manylinux2010"
+         )
+-        if platform.system() != "Linux":
++        if platform.system() != "Linux" or not is_x86:
+             monkeypatch.setattr(distutils.util, "get_platform", lambda: "linux_x86_64")
++            monkeypatch.setattr(platform, "machine", lambda: "x86_64")
+         platforms = list(tags._linux_platforms(is_32bit=False))
+-        expected = ["manylinux2010_x86_64", "manylinux1_x86_64", "linux_x86_64"]
++        arch = platform.machine()
++        expected = ["manylinux2010_" + arch, "manylinux1_" + arch, "linux_" + arch]
+         assert platforms == expected
+ 
+-    def test_linux_platforms_manylinux2014(self, monkeypatch):
++    def test_linux_platforms_manylinux2014(self, is_x86, monkeypatch):
+         monkeypatch.setattr(
+             tags, "_is_manylinux_compatible", lambda name, _: name == "manylinux2014"
+         )
+-        if platform.system() != "Linux":
++        if platform.system() != "Linux" or not is_x86:
+             monkeypatch.setattr(distutils.util, "get_platform", lambda: "linux_x86_64")
++            monkeypatch.setattr(platform, "machine", lambda: "x86_64")
+         platforms = list(tags._linux_platforms(is_32bit=False))
++        arch = platform.machine()
+         expected = [
+-            "manylinux2014_x86_64",
+-            "manylinux2010_x86_64",
+-            "manylinux1_x86_64",
+-            "linux_x86_64",
++            "manylinux2014_" + arch,
++            "manylinux2010_" + arch,
++            "manylinux1_" + arch,
++            "linux_" + arch,
+         ]
+         assert platforms == expected
+ 

gnu/packages/python-xyz.scm

@@ -16003,14 +16003,17 @@ several utilities, as well as an API for building localization tools.")
 (define-public python-packaging
   (package
     (name "python-packaging")
-    (version "20.4")
+    (version "20.0")
     (source
       (origin
         (method url-fetch)
         (uri (pypi-uri "packaging" version))
+        ;; XXX: The URL in the patch file is wrong, it should be
+        ;; <https://github.com/pypa/packaging/pull/256>.
+        (patches (search-patches "python-packaging-test-arch.patch"))
         (sha256
          (base32
-          "1y3rc1ams1i25calk6b9jf1gl85ix5a23a146swjvhdr8x7zfms3"))))
+          "1y2ip3a4ykkpgnwgn85j6hkspcl0cg3mzms97f40mk57vwqq67gy"))))
     (build-system python-build-system)
     (arguments
      `(#:phases (modify-phases %standard-phases