configure: Require Python 2.6 RHEL-6 and SLES-11 provide Python 2.6. It'll also work on OS X back to 10.6. Signed-off-by: Markus Armbruster <armbru@redhat.com> Message-Id: <1441396383-17304-1-git-send-email-armbru@redhat.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>