* NEWS: Mention the addition.
* modules/idcache (Files): Add lib/idcache.h
* lib/idcache.c: Include "idcache.h".
Don't include <sys/types.h>.
Add a FIXME comment.
Move file-scoped "static" declarations to the top.
* lib/idcache.h: New file. Include <sys/types.h> here, instead.
continue using the flexible array member (thus, this module performs
half as many malloc calls), with the addition that...
(getgroup, getuser): Consistently record a non-match via an empty
"name" string, and map an empty string match to a NULL return value.
* modules/idcache (Depends-on): Re-add flexmember.