Allow build to succeed with OpenBLAS.

On Ubuntu 13.04 with OpenBLAS installed according to instructions in
http://osdf.github.io/blog/numpyscipy-with-openblas-for-ubuntu-1204-second-try.html
numpy.distutils.system_info.get_info returns

{'define_macros': [('ATLAS_INFO', '"\\"None\\""')],
 'include_dirs': ['/usr/local/include'],
 'language': 'c',
 'libraries': ['openblas'],
 'library_dirs': ['/usr/local/lib']}.

The build then fails when unable to import lcblas.

This change allows the build to succeed.