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


I guess you could use a simple string search

```
for arg in extra_link_args:
    if 'vecLib' in arg:
        return True
```

Otherwise, I guess rename `r_accelerate` to `r_veclib` for clarity.