libio/dbz won't compile (patch)

[N8TM@aol.com]

>Recently dbz stopped compiling, which of course aborts >'make check' at
> the very beginning of its run.

There are a bunch of Unix'isms in this section anyway, so it has been necessary to remove dbz from the list of directories for make check on certain targets, or to run 'make -k check' which skips the whole libio section.

Is there an explanation somewhere of the goals of the dbz tests? Seemingly they are designed to test among other things whether text and binary mode files are identical, and fail if not, and to test whether it is possible to remove a directory after taking write permission off, and fail if not.  What do these have to do with testing g++ or libio?