pgsql: Add support for Motorola 88K to s_lock.h.

Add support for Motorola 88K to s_lock.h.

Apparently there are still people out there who care about this old
architecture. They probably care about dusty versions of Postgres
too, so back-patch to all supported branches.

David Carlier (from a patch being carried by OpenBSD packagers)

Discussion: /messages/by-id/CA+XhMqzwFSGVU7MEnfhCecc8YdP98tigXzzpd0AAdwaGwaVXEA@mail.gmail.com

Branch
------
REL_10_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/1ecf7eeb8719e2fab008c37c17590cf3840cfc5b

Modified Files
--------------
src/include/storage/s_lock.h | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)