Python 3.2 hash() return value is arch dependant

Python 3.2 hash() function will now return a 64bit value when run on a 64bit
architecture, where as previously, it would always return a 32bit value.
Modified the code to use the now Py_hash_t typedef and for Python versions
less than 3.2, hard code Py_hash_t to long and Py_uhash_t to unsigned long.

psycopg/notify_type.c

@@ -189,10 +189,10 @@ exit:
 }
 
 
-long
+Py_hash_t
 notify_hash(NotifyObject *self)
 {
-    long rv = -1L;
+    Py_hash_t rv = -1L;
     PyObject *tself = NULL;
 
     /* if self == a tuple, then their hashes are the same. */

psycopg/python.h

@@ -54,6 +54,15 @@
   #define CONV_CODE_PY_SSIZE_T "n"
 #endif
 
+/* hash() return size changed around version 3.2a4 on 64bit platforms.  Before
+ *   this, the return size was always a long, regardless of arch.  ~3.2 
+ *   introduced the Py_hash_t & Py_uhash_t typedefs with the resulting sizes
+ *   based upon arch. */
+#if PY_VERSION_HEX < 0x030200A4
+typedef long Py_hash_t;
+typedef unsigned long Py_uhash_t;
+#endif
+
 /* Macros defined in Python 2.6 */
 #ifndef Py_REFCNT
 #define Py_REFCNT(ob)           (((PyObject*)(ob))->ob_refcnt)