package/python-scipy: new package

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
[Arnout:
 - Indent hash file with two spaces.
 - Bump to 1.7.3 to fix build failure with recent GCC.
 - Get from github instead of PyPI.
 - Add host-meson and host-python-pythran dependencies.
 - Properly propagate Config.in dependencies.
 - Correct usage of BR2_INSTALL_LIBSTDCPP symbol.
 - Remove F77, no longer used.
]
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
[Guillaume:
 - -lnpymath: npymath.ini localization problem
 - -lnpyrandom resolution problem
 - fix legal-info for latest version LICENSE.txt
 - zlib is a scipy::io module runtime requirement
 - update serie for scipy 1.8.1 (latest)
]
Signed-off-by: Guillaume W. Bres <guillaume.bressaix@gmail.com>
[Thomas:
 - add runtime test
 - drop dependency on OpenBLAS, which is not needed in a minimal
   configuration
 - remove PYTHON_SCIPY_NPY_PKG_CONFIG_PATH logic as it is no longer
   needed
]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>