py3: use print_function in filterpyflakes.py

tests/filterpyflakes.py

@@ -2,7 +2,7 b''
 
 # Filter output by pyflakes to control which warnings we check
 
-from __future__ import absolute_import
+from __future__ import absolute_import, print_function
 
 import re
 import sys
@@ -54,8 +54,8 b' for line in sys.stdin:'
 
 for msgtype, line in sorted(lines, key=makekey):
     sys.stdout.write(line)
-print
+print()
 
 # self test of "undefined name" detection for other than 'memoryview'
 if False:
-    print undefinedname
+    print(undefinedname)

tests/test-check-py3-compat.t

@@ -40,7 +40,6 b''
   i18n/check-translation.py not using absolute_import
   i18n/polib.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
   tests/get-with-headers.py requires print_function
   tests/heredoctest.py requires print_function
@@ -259,7 +258,6 b''
   mercurial/win*.py: error importing module: <ImportError> No module named 'msvcrt' (line *) (glob)
   mercurial/windows.py: error importing module: <ImportError> No module named '_winreg' (line *) (glob)
   mercurial/wireproto.py: error importing module: <SyntaxError> invalid syntax (bundle*.py, line *) (line *) (glob)
-  tests/filterpyflakes.py: invalid syntax: Missing parentheses in call to 'print' (<unknown>, line *) (glob)
   tests/generate-working-copy-states.py: invalid syntax: Missing parentheses in call to 'print' (<unknown>, line *) (glob)
   tests/get-with-headers.py: invalid syntax: Missing parentheses in call to 'print' (<unknown>, line *) (glob)
   tests/readlink.py: invalid syntax: invalid syntax (<unknown>, line *) (glob)