Fix problems in x64 build that were discovered by the testsuite:

- Reenable modules on x64 that had been disabled aeons ago for Itanium.
- Cleared up confusion about compilers for 64 bit windows.  There is only Itanium and x64.  Added macros MS_WINI64 and MS_WINX64 for those rare cases where it matters, such as the disabling of modules above.
- Set target platform (_WIN32_WINNT and WINVER) to 0x0501 (XP) for x64, and 0x0400 (NT 4.0) otherwise, which are the targeted minimum platforms.
- Fixed thread_nt.h.  The emulated InterlockedCompareExchange function didn´t work on x64, probaby due to the lack of a "volatile" specifier.  Anyway, win95 is no longer a target platform.
- Itertools module used wrong constant to check for overflow in count()
- PyInt_AsSsize_t couldn't deal with attribute error when accessing the __long__ member.
- PyLong_FromSsize_t() incorrectly specified that the operand were unsigned.

With these changes, the x64 passes the testsuite, for those modules present.

Objects/intobject.c

@@ -215,6 +215,10 @@ PyInt_AsSsize_t(register PyObject *op)
 
 	if (nb->nb_long != 0) {
 		io = (PyIntObject*) (*nb->nb_long) (op);
+		if (io == NULL && PyErr_ExceptionMatches(PyExc_AttributeError)) {
+			PyErr_Clear();
+			io = (PyIntObject*) (*nb->nb_int) (op);
+		}
 	} else {
 		io = (PyIntObject*) (*nb->nb_int) (op);
 	}