gnu: Remove python-flake8 native-input from some packages.

Remove python-flake8 from [native-inputs] in the following packages as
not required for build/tests/install:

* gnu/packages/bioinformatics.scm: (python-doubletdetection)
* gnu/packages/ebook.scm: (calibre)
* gnu/packages/graph.scm: (python-pygsp)
* gnu/packages/machine-learning.scm: (python-pymanopt, python-pyro-api)
* gnu/packages/python-web.scm: (python-furl)
* gnu/packages/python-xyz.scm: (python-jinja2-cli)
* gnu/packages/simulation.scm: (python-dolfin-adjoint)
* gnu/packages/vpn.scm: (sshuttle)

* gnu/packages/music.scm (python-mutagen):
  [arguments]<#:test-flags>: Ignore flake8 quality tests.
  [native-inputs]: Remove python-flake8.

Change-Id: I2789b8711faf3aa60a4bfa2062f95616e216d6c3
Signed-off-by: Sharlatan Hellseher <sharlatanus@gmail.com>

gnu/packages/bioinformatics.scm

@@ -2896,8 +2896,7 @@ demultiplexing step.")
            python-scipy
            python-tqdm))
     (native-inputs
-     (list python-flake8
-           python-poetry-core
+     (list python-poetry-core
            python-pytest))
     (home-page "https://github.com/JonathanShor/DoubletDetection")
     (synopsis

gnu/packages/ebook.scm

@@ -173,7 +173,6 @@ with Microsoft Compiled HTML (CHM) files.")
      (list bash-minimal
            cmake
            pkg-config
-           python-flake8
            python-pyqt-builder
            qtbase ; for qmake
            xdg-utils

gnu/packages/machine-learning.scm

@@ -1522,7 +1522,6 @@ learning.")
                ((",!=1.12\\.\\*") "")))))))
     (propagated-inputs (list python-numpy python-scipy))
     (native-inputs (list python-autograd
-                         python-flake8
                          python-flake8-bugbear
                          python-isort
                          python-matplotlib
@@ -6253,8 +6252,7 @@ and Numpy.")
     (build-system pyproject-build-system)
     (arguments '(#:tests? #false)) ;requires pyro
     (native-inputs
-     (list python-flake8
-           python-ipython
+     (list python-ipython
            python-pytest
            python-setuptools
            python-sphinx

gnu/packages/music.scm

@@ -4062,6 +4062,7 @@ formats, looking up tracks through metadata and audio fingerprints.")
     (build-system pyproject-build-system)
     (arguments
      (list
+      #:test-flags '(list "--ignore=tests/quality/test_flake8.py")
        #:phases
        #~(modify-phases %standard-phases
            (add-before 'check 'remove-hypothesis-deadlines
@@ -4072,8 +4073,7 @@ formats, looking up tracks through metadata and audio fingerprints.")
                  (("( +)@given" all spaces)
                   (string-append spaces "@settings(deadline=None)\n" all))))))))
     (native-inputs
-     (list python-flake8
-           python-hypothesis
+     (list python-hypothesis
            python-pytest
            python-setuptools
            python-wheel))

gnu/packages/python-web.scm

@@ -3217,7 +3217,7 @@ origin than that of the web application.")
     (propagated-inputs
      (list python-orderedmultidict python-six))
     (native-inputs
-     (list python-flake8 python-pytest python-setuptools python-wheel))
+     (list python-pytest python-setuptools python-wheel))
     (home-page "https://github.com/gruns/furl")
     (synopsis "URL manipulation in Python")
     (description "Furl provides an easy-to-use alternative to the

gnu/packages/python-xyz.scm

@@ -31935,8 +31935,7 @@ Screenflick.")
     (propagated-inputs
      (list python-jinja2))
     (native-inputs
-     (list python-flake8
-           python-jinja2
+     (list python-jinja2
            python-pytest
            python-setuptools
            python-wheel))

gnu/packages/simulation.scm

@@ -1506,7 +1506,6 @@ counters and tunnels).")
      (list pkg-config
            python-coverage
            python-decorator
-           python-flake8
            python-pkgconfig
            python-pytest
            python-setuptools

gnu/packages/vpn.scm

@@ -1241,7 +1241,6 @@ private network between hosts on the internet.")
     (native-inputs
      (list python-setuptools-scm
            ;; For tests only.
-           python-flake8
            python-mock
            python-poetry-core
            python-pytest-cov