maintcheck: whitelist some false positives

Instead of tweaking or dumbing down some of our sources or tests
in order not to make them spuriously trigger few maintainer checks,
we tweak such checks instead.

* syntax-checks.mk (sc_tests_overriding_macros_on_cmdline): Also
allow the variable 'exp' to be overridden on the make command line.
Whitelist the test 'make-dryrun.test' where appropriate.
(sc_mkinstalldirs): When whitelisting the 'mkinstalldirs' occurrence
in 'lib/Makefile.am', do not look for the exact line number: it is
obviously too fragile.

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