Fuzz input to dns_rdata_fromwire(). Then convert the result
to text, back to wire format, to multiline text, and back to wire
format again, checking for consistency throughout the sequence.
(cherry picked from commit 8ffdf6759e)
Add a missing semicolon to prevent "make test" run from the top-level
directory from failing even when all system and unit tests succeed due
to "(cd fuzz && ${MAKE} check)" returning a non-zero exit code.