Sphinx >= 1.6 can't use recommonmark. debian/stable is ancient enough to have an older version. Change-Id: I287deab9168ab6124b05d0c6d6e8cdbd7fdc2eec Signed-off-by: Patrick Georgi <patrick@georgi.software> Reviewed-on: https://review.coreboot.org/26699 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Philipp Deppenwiese <zaolin.daisuki@gmail.com>