The test framework used to treat them specially (but no longer does). Add
these test cases as non-regression for how the test framework allows "?"
and especially "??" (which I think in the very distant path needed special
handling because the test data was embedded in a .c file, and thus ?? could
be interpreted as the prefix of a trigraph).
Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
578613322a