gnu: Remove python-flake8@3.5.

* gnu/packages/python-xyz.scm (python-flake8-3.5): Rename to ...
(python-flake8): ... this.  Update to 3.6.0.  Remove previous variant.
[arguments]: Remove phases 'delete-broken-test' and 'fix-problem-with-pycodestyle'.
[properties]: Adjust for renamed variable.
(python2-flake8-3.5): Rename to ...
(python2-flake8): ... this.  Remove previous variable.
* gnu/packages/check.scm (python-hypothesis)[native-inputs]: Adjust accordingly.

gnu/packages/check.scm

@@ -1456,8 +1456,7 @@ instantly.")
                 "0fvq4mfybm129l978war86mcshkn28dkrxw7lr8549zr9ywvik1c"))))
     (build-system python-build-system)
     (native-inputs
-     `(;; FIXME: Change to python-flake8 in the next rebuild cycle.
-       ("python-flake8" ,python-flake8-3.5)
+     `(("python-flake8" ,python-flake8)
        ("python-pytest" ,python-pytest-bootstrap)))
     (propagated-inputs
      `(("python-attrs" ,python-attrs-bootstrap)

gnu/packages/python-xyz.scm

@@ -5556,35 +5556,20 @@ complexity of Python source code.")
 (define-public python2-pyflakes-0.8.1
   (package-with-python2 python-pyflakes-0.8.1))
 
-;; This package is used by hypothesis which has thousands of dependent packages.
-;; FIXME: Consolidate this with "python-flake8" below in the next rebuild cycle.
-(define-public python-flake8-3.5
+(define-public python-flake8
   (package
     (name "python-flake8")
-    (version "3.5.0")
-    (source
-      (origin
-        (method url-fetch)
-        (uri (pypi-uri "flake8" version))
-        (sha256
-          (base32
-            "184b33grvvjmiwlv9kyd7yng9qv5ld24154j70z332xxg9gjclvj"))))
+    (version "3.6.0")
+    (source (origin
+              (method url-fetch)
+              (uri (pypi-uri "flake8" version))
+              (sha256
+               (base32
+                "0w0nprx22rbvrrkbfx9v5jc5gskbm08g219l7r8wai8zfswgadba"))))
     (build-system python-build-system)
     (arguments
      `(#:phases
        (modify-phases %standard-phases
-         ;; Two errors don't seem to have assigned codes.
-         (add-after 'unpack 'delete-broken-test
-           (lambda _ (delete-file "tests/unit/test_pyflakes_codes.py") #t))
-         (add-after 'unpack 'fix-problem-with-pycodestyle
-           (lambda _
-             ;; See https://gitlab.com/pycqa/flake8/merge_requests/230
-             ;; This should no longer be needed with the next release.
-             (substitute* "setup.py"
-               (("PEP8_PLUGIN\\('break_around_binary_operator'\\),")
-                "PEP8_PLUGIN('break_after_binary_operator'),\
-PEP8_PLUGIN('break_before_binary_operator'),"))
-             #t))
          (delete 'check)
          (add-after 'install 'check
            (lambda* (#:key inputs outputs #:allow-other-keys)
@@ -5604,45 +5589,17 @@ PEP8_PLUGIN('break_before_binary_operator'),"))
       "The modular source code checker: pep8, pyflakes and co")
     (description
       "Flake8 is a wrapper around PyFlakes, pep8 and python-mccabe.")
-    (properties `((python2-variant . ,(delay python2-flake8-3.5))))
+    (properties `((python2-variant . ,(delay python2-flake8))))
     (license license:expat)))
 
-(define-public python2-flake8-3.5
-  (let ((base (package-with-python2 (strip-python2-variant python-flake8-3.5))))
+(define-public python2-flake8
+  (let ((base (package-with-python2 (strip-python2-variant python-flake8))))
     (package (inherit base)
       (propagated-inputs
        `(("python2-configparser" ,python2-configparser)
          ("python2-enum34" ,python2-enum34)
           ,@(package-propagated-inputs base))))))
 
-;; Version 3.5.0 has compatibility issues with Pyflakes 2.0, so we need
-;; this newer version.  Keep it as a separate variable for now to avoid
-;; rebuilding "python-hypothesis"; this should be removed in the next
-;; rebuild cycle.
-(define-public python-flake8
-  (package
-    (inherit python-flake8-3.5)
-    (version "3.6.0")
-    (source (origin
-              (method url-fetch)
-              (uri (pypi-uri "flake8" version))
-              (sha256
-               (base32
-                "0w0nprx22rbvrrkbfx9v5jc5gskbm08g219l7r8wai8zfswgadba"))))
-    (arguments
-     (substitute-keyword-arguments (package-arguments python-flake8-3.5)
-       ((#:phases phases)
-        `(modify-phases ,phases
-           (delete 'delete-broken-test)
-           (delete 'fix-problem-with-pycodestyle)))))
-    (properties `((python2-variant . ,(delay python2-flake8))))))
-
-(define-public python2-flake8
-  (let ((base (package-with-python2 (strip-python2-variant python-flake8))))
-    (package (inherit base)
-             (propagated-inputs
-              (package-propagated-inputs python2-flake8-3.5)))))
-
 ;; python-hacking requires flake8 <2.6.0.
 (define-public python-flake8-2.5
   (package