Compilation of master fails following datetime parsing changes.
As of commit 67323069fb5e8f1de3000d7606d26172a2e18a9f, I'm no longer able to compile pandas.

```
$ python setup.py install
running install
running bdist_egg
running egg_info
writing requirements to pandas.egg-info/requires.txt
writing pandas.egg-info/PKG-INFO
writing top-level names to pandas.egg-info/top_level.txt
writing dependency_links to pandas.egg-info/dependency_links.txt
reading manifest file 'pandas.egg-info/SOURCES.txt'
reading manifest template 'MANIFEST.in'
warning: no files found matching 'README.rst'
warning: no previously-included files matching '*.pyd' found anywhere in distribution
warning: no previously-included files matching '*~' found anywhere in distribution
warning: no previously-included files matching '#*' found anywhere in distribution
warning: no previously-included files matching '.DS_Store' found anywhere in distribution
writing manifest file 'pandas.egg-info/SOURCES.txt'
installing library code to build/bdist.linux-x86_64/egg
running install_lib
running build_py
copying pandas/version.py -> build/lib.linux-x86_64-2.7/pandas
running build_ext
building 'pandas.index' extension
gcc -pthread -fno-strict-aliasing -O2 -g -m64 -mtune=generic -D_GNU_SOURCE -fPIC -fwrapv -I/usr/kerberos/include -DNDEBUG -O2 -g -m64 -mtune=generic -D_GNU_SOURCE -fPIC -fwrapv -fPIC -Ipandas/src/klib -Ipandas/src -I/users/is/whughes/pyenvs/pandas2/lib/python2.7/site-packages/numpy-1.8.2-py2.7-linux-x86_64.egg/numpy/core/include -I/opt/ahl/releases/python/2.7.3/include/python2.7 -c pandas/index.c -o build/temp.linux-x86_64-2.7/pandas/index.o
In file included from /users/is/whughes/pyenvs/pandas2/lib/python2.7/site-packages/numpy-1.8.2-py2.7-linux-x86_64.egg/numpy/core/include/numpy/ndarraytypes.h:1761:0,
                 from /users/is/whughes/pyenvs/pandas2/lib/python2.7/site-packages/numpy-1.8.2-py2.7-linux-x86_64.egg/numpy/core/include/numpy/ndarrayobject.h:17,
                 from /users/is/whughes/pyenvs/pandas2/lib/python2.7/site-packages/numpy-1.8.2-py2.7-linux-x86_64.egg/numpy/core/include/numpy/arrayobject.h:4,
                 from pandas/index.c:346:
/users/is/whughes/pyenvs/pandas2/lib/python2.7/site-packages/numpy-1.8.2-py2.7-linux-x86_64.egg/numpy/core/include/numpy/npy_1_7_deprecated_api.h:15:2: warning: #warning "Using deprecated NumPy API, disable it by " "#defining NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION" [-Wcpp]
pandas/index.c: In function '__pyx_f_8datetime__cstring_to_dts':
pandas/index.c:11472:3: warning: passing argument 6 of 'parse_iso_8601_datetime' from incompatible pointer type [enabled by default]
In file included from pandas/index.c:357:0:
pandas/src/datetime/np_datetime_strings.h:46:1: note: expected 'int *' but argument is of type 'npy_bool *'
pandas/index.c:11472:3: warning: passing argument 7 of 'parse_iso_8601_datetime' from incompatible pointer type [enabled by default]
In file included from pandas/index.c:357:0:
pandas/src/datetime/np_datetime_strings.h:46:1: note: expected 'int *' but argument is of type 'enum PANDAS_DATETIMEUNIT *'
pandas/index.c:11472:3: warning: passing argument 8 of 'parse_iso_8601_datetime' from incompatible pointer type [enabled by default]
In file included from pandas/index.c:357:0:
pandas/src/datetime/np_datetime_strings.h:46:1: note: expected 'enum PANDAS_DATETIMEUNIT *' but argument is of type 'npy_bool *'
pandas/index.c:11472:3: error: too few arguments to function 'parse_iso_8601_datetime'
In file included from pandas/index.c:357:0:
pandas/src/datetime/np_datetime_strings.h:46:1: note: declared here
error: command 'gcc' failed with exit status 1
```

I've tested with GCC 4.1 and 4.7, and numpy 1.7 and 1.8. The traceback shown is GCC 4.7 with numpy 1.8.
