py3compat: use absolute_import

mercurial/py3kcompat.py

@@ -5,9 +5,12 b''
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
-import builtins
+from __future__ import absolute_import
 
-from numbers import Number
+import builtins
+import numbers
+
+Number = numbers.Number
 
 def bytesformatter(format, args):
     '''Custom implementation of a formatter for bytestrings.

tests/test-check-py3-compat.t

@@ -118,7 +118,6 b''
   mercurial/mail.py requires print_function
   mercurial/manifest.py not using absolute_import
   mercurial/pvec.py not using absolute_import
-  mercurial/py3kcompat.py not using absolute_import
   setup.py not using absolute_import
   tests/filterpyflakes.py requires print_function
   tests/generate-working-copy-states.py requires print_function