package/ltp-testsuite: bump to version 20200120

package/ltp-testsuite: bump to version 20200120

Drop all patches. All but
0001-rpc-tirpc-disable-tirpc_auth_authdes_-create-tests.patch were
backported from this release, this one is not needed any more due
upstream commit f7199c464 ("rpc-tirpc: Remove authdes related tests")

Thus remove also LTP_TESTSUITE_AUTORECONF.

Update also list of unsupported tests on musl (broken rpc-tirpc tests
were fixed in this release).

Signed-off-by: Petr Vorel <petr.vorel@gmail.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>