* catgets/open_catalog.c: Rewrite code to assume that the function
is called at catopen time and not delayed in catgets.
* catgets/catgets.c (catopen): Call __open_catalog and fail if that
function failed.
(catgets): Remove code for delayed opening of catalog.
* catgets/catgetsinfo.h: Remove now unnecessary information from
struct catalog_info. Change __open_catalog prototype.
* catgets/gencat.c: Adjust __open_catalog call.
* catgets/test-gencat.c: Stop program if catopen failed.