Revert "XXX try to revert win32 WA"

This reverts commit b461b81.

Author: skirpichev

Lib/test/test_capi/test_float.py

@@ -187,7 +187,10 @@ def test_pack_unpack_roundtrip_nans(self):
         for _ in range(100):
             for size in (2, 4, 8):
                 sign = random.randint(0, 1)
-                quiet = random.randint(0, 1)
+                if sys.platform != 'win32':
+                    quiet = random.randint(0, 1)
+                else:
+                    quiet = 1  # doesn't work for sNaN's here
                 if size == 8:
                     payload = random.randint(0 if quiet else 1, 1<<50)
                     i = (sign<<63) + (0x7ff<<52) + (quiet<<51) + payload

Lib/test/test_struct.py

@@ -936,6 +936,9 @@ def test_half_float(self):
             self.assertTrue(math.isnan(struct.unpack('>e', bits[::-1])[0]))
 
             # Check round-trip for NaN's:
+            if (sys.platform == 'win32'
+                    and not (int.from_bytes(bits[::-1]) & (1<<9))):
+                continue  # doesn't work for sNaN's here
             nan = struct.unpack('<e', bits)[0]
             self.assertEqual(struct.pack('<e', nan), bits)
             nan = struct.unpack('>e', bits[::-1])[0]