Fix Windows build: handles is declared after statement

Hi,

Since the ```handles``` variable is declared after a statement, the VS C compiler complaints and the build fails:
```
C:\Program Files (x86)\Microsoft Visual Studio 9.0\VC\BIN\cl.exe /c /nologo /Ox
/MD /W3 /GS- /DNDEBUG -DMODULE_VERSION=0.11.1 -DLIBUV_REVISION=9d44d78 -DWIN32=1
 -IC:\Python\include -IC:\Python\PC -Ideps\libuv\include /Tcsrc/pyuv
.c /Fobuild\temp.win32-2.7\Release\src/pyuv.obj
pyuv.c
c:\users\user\python-packages\pyuv\src\loop.c(329) : error C2275
: 'PyObject' : illegal use of this type as an expression
        c:\python\include\object.h(108) : see declaration of 'PyObject'
```