gnu: python-matplotlib-documentation: Fix build.
* gnu/packages/python-xyz.scm (python-matplotlib-documentation): Inherit from
python-matplotlib.
[version, source, build-system, home-page, description, license]: Delete
fields, now inherited.
[phases]: Streamline build and install phases and enable parallel build.
[native-inputs]: Use new style. Remove python-matplotlib, python-ipykernel,
python-mock, texlive-enumitem, texlive-latex-geometry, texlive-latex-preview,
texlive-latex-ucs, texlive-pdftex, texlive-fonts-ec, texlive-txfonts and
inherited python-matplotlib packages.
Add inkscape, python-mpl-sphinx-theme, python-scipy, python-ipywidgets,
texlive-babel, texlive-fontspec, texlive-unicode-math, texlive-etoolbox,
and texlive-underscore.
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