revert redundant test

Author: skirpichev

Lib/test/test_struct.py

@@ -935,15 +935,6 @@ def test_half_float(self):
             self.assertTrue(math.isnan(struct.unpack('<e', bits)[0]))
             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]
-            self.assertEqual(struct.pack('>e', nan), bits[::-1])
-
         # Check that packing produces a bit pattern representing a quiet NaN:
         # all exponent bits and the msb of the fraction should all be 1.
         packed = struct.pack('<e', math.nan)