* gnu/packages/python-xyz.scm (python-numpy): Update to 1.21.6. Move inputs
and native-inputs fields after arguments. Use gexps.
[modules]: New argument.
[phases]{parallelize-build}: New phase.
{configure-blas}: Format via (ice-9 format).
{fix-executable-paths}: Use search-file-input. Remove obsolete system_info.py
substitution.
{check}: Remove extraneous add-installed-pythonpath and setenv calls. Provide
the '-n' pytest-xdist option.
[native-inputs]: Use python-hypothesis-next.
(python-numpy-next): Inherit from python-numpy.
(python2-numpy): Adjust for gexps.
[phases]{delete-failing-test}: Rename to...
{delete-failing-tests}: ... this.
(python2-numpy-1.8): Likewise, and delete 'delete-failing-tests' phase.
Disable tests.
[native-inputs]: Define as the empty list.
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