Symbol not found: _floatify in pandas/lib.so on Mac 10.8 with numpy master
After updating pandas I can't import it any more because the symbol _floatify is undefined in pandas/lib.so:

```
$ python -c 'import pandas'
dlopen(/Users/deil/Library/Python/2.7/lib/python/site-packages/pandas-0.9.1.dev_7156920-py2.7-macosx-10.8-x86_64.egg/pandas/lib.so, 2): Symbol not found: _floatify
  Referenced from: /Users/deil/Library/Python/2.7/lib/python/site-packages/pandas-0.9.1.dev_7156920-py2.7-macosx-10.8-x86_64.egg/pandas/lib.so
  Expected in: flat namespace
 in /Users/deil/Library/Python/2.7/lib/python/site-packages/pandas-0.9.1.dev_7156920-py2.7-macosx-10.8-x86_64.egg/pandas/lib.so
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/Users/deil/Library/Python/2.7/lib/python/site-packages/pandas-0.9.1.dev_7156920-py2.7-macosx-10.8-x86_64.egg/pandas/__init__.py", line 10, in <module>
    import pandas.lib as lib
ImportError: dlopen(/Users/deil/Library/Python/2.7/lib/python/site-packages/pandas-0.9.1.dev_7156920-py2.7-macosx-10.8-x86_64.egg/pandas/lib.so, 2): Symbol not found: _floatify
  Referenced from: /Users/deil/Library/Python/2.7/lib/python/site-packages/pandas-0.9.1.dev_7156920-py2.7-macosx-10.8-x86_64.egg/pandas/lib.so
  Expected in: flat namespace
 in /Users/deil/Library/Python/2.7/lib/python/site-packages/pandas-0.9.1.dev_7156920-py2.7-macosx-10.8-x86_64.egg/pandas/lib.so

$ otool -L /Users/deil/Library/Python/2.7/lib/python/site-packages/pandas-0.9.1.dev_7156920-py2.7-macosx-10.8-x86_64.egg/pandas/lib.so
/Users/deil/Library/Python/2.7/lib/python/site-packages/pandas-0.9.1.dev_7156920-py2.7-macosx-10.8-x86_64.egg/pandas/lib.so:
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current version 169.3.0)
$ nm /Users/deil/Library/Python/2.7/lib/python/site-packages/pandas-0.9.1.dev_7156920-py2.7-macosx-10.8-x86_64.egg/pandas/lib.so | grep floatify
                 U _floatify
```

The pandas build log doesn't show any problem with `lib.so` or `floatify`:
https://gist.github.com/4030153

My numpy install seems OK:
https://gist.github.com/4030177
