maintcheck: remove outdated whitelisting * syntax-checks.mk (sc_tests_overriding_macros_on_cmdline): Here. The test 'make-dryrun.sh' has been since long rewritten as the TAP test 'make-dryrun.tap', and no longer spuriously triggers this maintainer check. Signed-off-by: Stefano Lattarini <stefano.lattarini@gmail.com>