build failure of master on windows
the nightly windows builds don't appear to be produced anymore since mid january, and as we need some fixes in master i tried to build amd64 seems to work fine, but that's using windows SDK 7.0, when using VS 2008 Express or mingw I get different problems:

```
c:\Program Files\Microsoft Visual Studio 9.0\VC\BIN\cl.exe /c /nologo /Ox /MD /W3 /GS- /DNDEBUG -Ipandas/src/klib -Ipandas/src -IC:\Python27
\lib\site-packages\numpy\core\include -IC:\Python27\include -IC:\Python27\PC /Tcpandas/src/datetime/np_datetime.c /Fobuild\temp.win32-2.7\Release\pandas/src/datetime/np_datetime.obj
np_datetime.c
c:\python27\lib\site-packages\numpy\core\include\numpy\npy_1_7_deprecated_api.h(12) : Warning Msg: Using deprecated NumPy API, disable it by
 #defining NPY_NO_DEPRECATED_API NPY_1_7_API_VERSION
pandas/src/datetime/np_datetime.c(229) : error C2143: syntax error : missing ')' before '('
pandas/src/datetime/np_datetime.c(229) : error C2143: syntax error : missing ')' before '('
pandas/src/datetime/np_datetime.c(229) : error C2091: function returns function
pandas/src/datetime/np_datetime.c(229) : error C2143: syntax error : missing ')' before 'string'
pandas/src/datetime/np_datetime.c(229) : error C2091: function returns function
pandas/src/datetime/np_datetime.c(229) : error C2143: syntax error : missing '{' before 'string'
pandas/src/datetime/np_datetime.c(229) : error C2059: syntax error : '<Unknown>'
pandas/src/datetime/np_datetime.c(229) : error C2059: syntax error : ')'
pandas/src/datetime/np_datetime.c(229) : error C2059: syntax error : ')'
pandas/src/datetime/np_datetime.c(229) : error C2059: syntax error : ')'
pandas/src/datetime/np_datetime.c(267) : warning C4244: '=' : conversion from 'npy_int64' to 'npy_int32', possible loss of data
pandas/src/datetime/np_datetime.c(852) : warning C4244: '=' : conversion from 'npy_datetime' to 'npy_int32', possible loss of data
pandas/src/datetime/np_datetime.c(866) : warning C4244: '=' : conversion from 'npy_datetime' to 'npy_int32', possible loss of data
pandas/src/datetime/np_datetime.c(881) : warning C4244: '=' : conversion from 'npy_datetime' to 'npy_int32', possible loss of data
pandas/src/datetime/np_datetime.c(897) : warning C4244: '=' : conversion from '__int64' to 'npy_int32', possible loss of data
pandas/src/datetime/np_datetime.c(914) : warning C4244: '=' : conversion from '__int64' to 'npy_int32', possible loss of data
pandas/src/datetime/np_datetime.c(931) : warning C4244: '=' : conversion from '__int64' to 'npy_int32', possible loss of data
pandas/src/datetime/np_datetime.c(949) : warning C4244: '=' : conversion from '__int64' to 'npy_int32', possible loss of data
pandas/src/datetime/np_datetime.c(959) : warning C4244: '=' : conversion from '__int64' to 'npy_int32', possible loss of data
pandas/src/datetime/np_datetime.c(976) : warning C4244: 'function' : conversion from 'npy_datetime' to 'int', possible loss of data
pandas/src/datetime/np_datetime.c(1002) : warning C4013: 'add_seconds_to_datetimestruct' undefined; assuming extern returning int
error: command '"c:\Program Files\Microsoft Visual Studio 9.0\VC\BIN\cl.exe"' failed with exit status 2
```

with mingw, it builds but cannot import:

```
DLL load failed: The specified module could not be found.
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Python27\lib\site-packages\pandas-0.13.1.dev-py2.7-win32.egg\pandas\__init__.py", line 6, in <module>
    from . import hashtable, tslib, lib
ImportError: DLL load failed: The specified module could not be found.
```

dependency versions are:

```
INSTALLED VERSIONS
------------------
commit: None
python: 2.7.6.final.0
python-bits: 32
OS: Windows
OS-release: XP
machine: x86
processor: x86 Family 6 Model 15 Stepping 2, GenuineIntel
byteorder: little
LC_ALL: None
LANG: None

pandas: 0.13.1.dev
Cython: 0.20
numpy: 1.8.0
scipy: 0.13.2
statsmodels: None
IPython: 1.1.0
sphinx: None
patsy: None
scikits.timeseries: None
dateutil: 2.2
pytz: 2013.9
bottleneck: 0.8.0
tables: 3.1.0
numexpr: 2.3
matplotlib: 1.3.1
openpyxl: 1.6.1
xlrd: 0.9.2
xlwt: 0.7.5
xlsxwriter: None
sqlalchemy: None
lxml: None
bs4: None
html5lib: None
bq: None
apiclient: None
```

mingw build output files are here:
https://github.com/ruidc/files/blob/master/build_output.txt
https://github.com/ruidc/files/blob/master/install_output.txt

run using:

```
python setup.py build --compiler=mingw32 > build_output.txt 2>&1
python setup.py install > install_output.txt 2>&1
```

and directory listing here:
https://github.com/ruidc/files/blob/master/dir.txt
