Revert "gnu: python-chardet: Enable tests."

This causes too many rebuilds for the master branch.

This reverts commit 331aaf5280.

gnu/local.mk

@@ -1491,7 +1491,6 @@ dist_patch_DATA =						\
   %D%/packages/patches/python-argcomplete-1.11.1-fish31.patch	\
   %D%/packages/patches/python-axolotl-AES-fix.patch		\
   %D%/packages/patches/python-cairocffi-dlopen-path.patch	\
-  %D%/packages/patches/python-chardet-3.0.4-pytest.patch	\
   %D%/packages/patches/python-cross-compile.patch		\
   %D%/packages/patches/python2-larch-coverage-4.0a6-compatibility.patch \
   %D%/packages/patches/python-configobj-setuptools.patch	\

gnu/packages/patches/python-chardet-3.0.4-pytest.patch

@@ -1,15 +0,0 @@
-Fix test failure with Pytest 4.
-
-Taken from upstream:
-https://github.com/chardet/chardet/commit/440828f8faafdb58700c64a9ea8f6a30b154c08b
-
-diff --git a/test.py b/test.py
---- a/test.py
-+++ b/test.py
-@@ -59,5 +59,5 @@ def gen_test_params():
-             full_path = join(path, file_name)
-             test_case = full_path, encoding
-             if full_path in EXPECTED_FAILURES:
--                test_case = pytest.mark.xfail(test_case)
-+                test_case = pytest.param(*test_case, marks=pytest.mark.xfail)
-             yield test_case

gnu/packages/python-xyz.scm

@@ -10060,13 +10060,14 @@ (define-public python-chardet
        (uri (pypi-uri "chardet" version))
        (sha256
         (base32
-         "1bpalpia6r5x1kknbk11p1fzph56fmmnp405ds8icksd3knr5aw4"))
-        (patches (search-patches "python-chardet-3.0.4-pytest.patch"))))
+         "1bpalpia6r5x1kknbk11p1fzph56fmmnp405ds8icksd3knr5aw4"))))
     (native-inputs
      `(("python-hypothesis" ,python-hypothesis)
        ("python-pytest" ,python-pytest)
        ("python-pytest-runner" ,python-pytest-runner)))
     (build-system python-build-system)
+    ;; XXX: Incompatible with Pytest 4: <https://github.com/chardet/chardet/issues/173>.
+    (arguments `(#:tests? #f))
     (home-page "https://github.com/chardet/chardet")
     (synopsis "Universal encoding detector for Python 2 and 3")
     (description