pycompat: remove check for Python >= 3.6

We dropped support for Python 3.5 so this is always true.

Differential Revision: https://phab.mercurial-scm.org/D12363

mercurial/pycompat.py

@@ -86,7 +86,7 b' def rapply(f, xs):'
     return _rapply(f, xs)
 
 
-if os.name == r'nt' and sys.version_info >= (3, 6):
+if os.name == r'nt':
     # MBCS (or ANSI) filesystem encoding must be used as before.
     # Otherwise non-ASCII filenames in existing repositories would be
     # corrupted.
@@ -415,7 +415,6 b' if sys.version_info[0:2] < (3, 6):'
 
         return json.loads(s, *args, **kwargs)
 
-
 else:
     json_loads = json.loads