py3: use bytes os.sep in doctest of pathutil.py

mercurial/pathutil.py

@@ -203,9 +203,9 b' def normasprefix(path):'
 
     See also issue3033 for detail about need of this function.
 
-    >>> normasprefix(b'/foo/bar').replace(os.sep, b'/')
+    >>> normasprefix(b'/foo/bar').replace(pycompat.ossep, b'/')
     '/foo/bar/'
-    >>> normasprefix(b'/').replace(os.sep, b'/')
+    >>> normasprefix(b'/').replace(pycompat.ossep, b'/')
     '/'
     '''
     d, p = os.path.splitdrive(path)

tests/test-doctest.py

@@ -58,7 +58,7 b" testmod('mercurial.match')"
 testmod('mercurial.mdiff')
 testmod('mercurial.minirst')
 testmod('mercurial.patch')
-testmod('mercurial.pathutil', py3=False)  # py3: os.sep
+testmod('mercurial.pathutil')
 testmod('mercurial.parser')
 testmod('mercurial.pycompat')
 testmod('mercurial.revsetlang')