these tests were skipped as they can't record the dynamic size. however,
there isn't a dynamic size to report as the type of the pointer is void.
accept a dynamic size of 0 as it's the best we can do with no type
knowledge.
The `oil_skip` test option was added for tests that don't work under OIL
but do work under OID. However, we now have two classes of `oil_skip`ped
tests: those that could be fixed, and those that will never work.
Increase clarity by not generating the tests which do not make sense at
all, leaving us with a cleaner set of skipped (and fixable) tests.
