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 https://github.com/scipy/scipy/blob/50012918db47f0ec3418dd53f0277daa589f82e3/doc/source/building/linux.rst#fortran-abi-mismatch