BLD: fix BLAS/LAPACK detection in Bento build.
BLD: fix Cythonizing sources in Bento build.
BLD: fix generated version.py in Bento build.
BLD: fix blas/lapack link issues in Bento build.
BLD: build integrate.lsoda and ndimage._ni_label extensions with Bento.
DOC: update instructions for building Scipy with Bento.
Merge pull request #2447 from rgommers/fix-bento-build

BLD: Fix Bento build