Patching numpy.distutils used to be required for pythonPackages.cython
to build on darwin. It was later accidentally disabled during one of the
refactorings, but that did not break cython. This change reinstantiates
the patch. It still applies, so it should be low maintenance and it can
still be useful.
The wrapper is not needed because the runpath is already set correctly,
and LD_LIBRARY_PATH was breaking child processes linked against
different libc versions.
Signed-off-by: Anders Kaseorg <andersk@mit.edu>