python.pkgs.scipy: set SCIPY_USE_G77_ABI_WRAPPER=1

To avoid segmentation fault on MKL, we need to use the CBLAS ABI.
Normally, scipy will autodetect this, but here we don’t link using the
‘libmkl_rt.so’ name. So we need to manually set this.

See 50012918db/doc/source/building/linux.rst (fortran-abi-mismatch)

pkgs/development/python-modules/scipy/default.nix

@@ -53,6 +53,8 @@ in buildPythonPackage rec {
 
   setupPyBuildFlags = [ "--fcompiler='gnu95'" ];
 
+  SCIPY_USE_G77_ABI_WRAPPER = 1;
+
   meta = {
     description = "SciPy (pronounced 'Sigh Pie') is open-source software for mathematics, science, and engineering. ";
     homepage = "https://www.scipy.org/";