BUG: Workaround for SGEMV segfault in Accelerate

Workaround for SGEMV segfault in Accelerate (OSX version 10.9)
Corrects scipy.linalg.blas.sgemv, ARPACK, SuperLU
similar to: 
https://github.com/numpy/numpy/pull/5223
https://github.com/scipy/scipy/pull/4104


Right - I am testing on OSX 10.9 with AVX, against a non-buggy numpy (ATLAS build), and with scipy newly built from master (without your patch), linked against Accelerate:

```
In [2]: scipy.__config__.show()
atlas_threads_info:
  NOT AVAILABLE
blas_opt_info:
    extra_link_args = ['-Wl,-framework', '-Wl,Accelerate']
    extra_compile_args = ['-msse3', '-I/System/Library/Frameworks/vecLib.framework/Headers']
    define_macros = [('NO_ATLAS_INFO', 3)]
openblas_info:
  NOT AVAILABLE
atlas_blas_threads_info:
  NOT AVAILABLE
lapack_opt_info:
    extra_link_args = ['-Wl,-framework', '-Wl,Accelerate']
    extra_compile_args = ['-msse3']
    define_macros = [('NO_ATLAS_INFO', 3)]
openblas_lapack_info:
  NOT AVAILABLE
atlas_info:
  NOT AVAILABLE
lapack_mkl_info:
  NOT AVAILABLE
blas_mkl_info:
  NOT AVAILABLE
atlas_blas_info:
  NOT AVAILABLE
mkl_info:
  NOT AVAILABLE

In [5]: scipy.__version__
Out[5]: '0.15.0.dev-4dacacc'
```

When I run the tests from this branch, against the unpatched scipy build above, I get this:

```
$ nosetests dev_trees/scipy/scipy/linalg/tests/test_fblas.py
.................................................................................................................................
----------------------------------------------------------------------
Ran 129 tests in 0.289s

OK
```

I have run the tests several times.  So - is it possible the tests are not catching the Accelerate bug?