[CI] CI failing for python Xcode 7.3

[asfimport]

The last couple of PR triggered builds have failed with this :

CMake Error at cmake_modules/FindNumPy.cmake:62 (message):
NumPy import failure:
Traceback (most recent call last):
File "", line 1, in
File "/Users/travis/build/apache/arrow/pyarrow-test-2.7/lib/python2.7/site-packages/numpy/init.py", line 142, in
from . import add_newdocs
File "/Users/travis/build/apache/arrow/pyarrow-test-2.7/lib/python2.7/site-packages/numpy/add_newdocs.py", line 13, in
from numpy.lib import add_newdoc
File "/Users/travis/build/apache/arrow/pyarrow-test-2.7/lib/python2.7/site-packages/numpy/lib/init.py", line 8, in
from .type_check import *
File "/Users/travis/build/apache/arrow/pyarrow-test-2.7/lib/python2.7/site-packages/numpy/lib/type_check.py", line 11, in
import numpy.core.numeric as _nx
File "/Users/travis/build/apache/arrow/pyarrow-test-2.7/lib/python2.7/site-packages/numpy/core/init.py", line 26, in
raise ImportError(msg)

https://travis-ci.org/apache/arrow/jobs/489917808

Reporter: Pindikura Ravindra / @pravindra
Assignee: Uwe Korn / @xhochy

PRs and other links:

• GitHub Pull Request #3581

_{Note: This issue was originally created as ARROW-4496. Please see the migration documentation for further details.}

[asfimport]

Uwe Korn / @xhochy:
conda-forge's pinning was broken. Packages all depend on gfortran 3.x and today 4.0 was released. 4.0 is sadly ABI breaking.

[asfimport]

Krisztian Szucs / @kszucs:
Issue resolved by pull request 3581
#3581