Error on discarded qualifiers in gcc

Error on discarded qualifiers in gcc

If a function call passes a const pointer to a function accepting the
same pointer type without the const qualifier, that should be treated
as an erorr if possible.  In sufficiently recent gcc, pass
-Werror=discarded-qualifiers.  (In clang, this is already covered by
-Werror=incompatible-pointer-types which we recently added.)