tests: Split run-copymany-sections.sh into separate tests

tests: Split run-copymany-sections.sh into separate tests

This test can take a very long time under valgrind (on s390x).
Split it into four tests for big/little endian, 32/64 bit.
That way the tests can run in parallel and each individual
test produces a result (so the buildbot won't time out).

	* tests/run-copymany-sections.sh: Delete and move
	generic part into...
	* tests/test-copymany-subr.sh: ... here.
	* tests/run-copymany-be32.sh: New big endian 32 bit tests.
	* tests/run-copymany-be64.sh: New big endian 64 bit tests.
	* tests/run-copymany-le32.sh: New little endian 32 bit tests.
	* tests/run-copymany-le64.sh: New little endian 64 bit tests.
	* tests/Makefile.am (TESTS): Remove run-copymany-sections.sh,
	add run-copymany-be32.sh, run-copymany-le32.sh,
	run-copymany-be64.sh and run-copymany-le64.sh.
	(EXTRA_DIST): Remove run-copymany-sections.sh. Add
	test-copymany-subr.sh, run-copymany-be32.sh,
	run-copymany-le32.sh, run-copymany-be64.sh and
	run-copymany-le64.sh.

Signed-off-by: Mark Wielaard <mark@klomp.org>