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.

--- a/Modules/itertoolsmodule.c	Thu May 03 20:09:56 2007 +0000
+++ b/Modules/itertoolsmodule.c	Thu May 03 20:27:03 2007 +0000
@@ -2073,9 +2073,9 @@
 static PyObject *
 count_next(countobject *lz)
 {
-        if (lz->cnt == LONG_MAX) {
+        if (lz->cnt == PY_SSIZE_T_MAX) {
                 PyErr_SetString(PyExc_OverflowError,
-                        "cannot count beyond LONG_MAX");                
+                        "cannot count beyond PY_SSIZE_T_MAX");                
                 return NULL;         
         }
 	return PyInt_FromSsize_t(lz->cnt++);