qapi: Fix cgen() for Python older than 2.7
A feature new in Python 2.7 crept into commit 77e703b8: re.subn()'s fifth argument. Avoid that, use re.compile(). Reported-by: NLaurent Desnogues <laurent.desnogues@gmail.com> Signed-off-by: NMarkus Armbruster <armbru@redhat.com> Reviewed-by: NEric Blake <eblake@redhat.com> Tested-by: NLaurent Desnogues <laurent.desnogues@gmail.com> Message-id: 1441640755-23902-1-git-send-email-armbru@redhat.com Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>
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