qapi.py: avoid Python 2.5+ any() function

qapi.py: avoid Python 2.5+ any() function

There is one instance of any() in qapi.py that breaks builds on older
distros that ship Python 2.4 (like RHEL5):

  GEN   qmp-commands.h
Traceback (most recent call last):
  File "build/scripts/qapi-commands.py", line 445, in ?
    exprs = parse_schema(input_file)
  File "build/scripts/qapi.py", line 329, in parse_schema
    schema = QAPISchema(open(input_file, "r"))
  File "build/scripts/qapi.py", line 110, in __init__
    if any(include_path == elem[1]
NameError: global name 'any' is not defined

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Benoît Canet <benoit.canet@nodalink.com>