Problem reported by Xinjian Ma (Bug#78084).
* tests/reference: Skip this test if od does not support -An -tx1
as POSIX requires. Also, omit an unnecessary use of tr, since
the $(...) already does that.
* tests/reference: Don't rely on od's -w option.
Instead, use tr -d '\n' to join the output lines.
Reported by Bruno Haible in https://bugs.gnu.org/73140
* tests/reference: New test. Without this test, there
was nothing to alert me to an error in the crc computation:
each new CRC was different, but all newly-compressed files
decompressed fine and had a valid (by the new check) CRC.
* tests/Makefile.am (TESTS): Add it.
Also move the "list-big" test to the front of the list, since
it is the most costly: start it first. Useful in a parallel test.
