tdb: enforce hashing, via example hash in old rwlocks entry in header.
[ccan] / ccan / build_assert /
drwxr-xr-x   ..
lrwxrwxrwx 23 LICENCE -> ../../licences/LGPL-2.1
-rw-r--r-- 1353 _info
-rw-r--r-- 1125 build_assert.h
drwxr-xr-x - test