make 3.81 doesn't print final error message after "waiting for unfinished jobs" for parallel builds

[Mike Coleman]

At least under some circumstances, make 3.81 doesn't print a final error message at the end of a parallel build that has failed.  Specifically, it prints an error message and then the "waiting for unfinished jobs" output.  Since the latter may include a lot of material, none of which looks like an error has happened, the user may be left with the impression that the build succeeded, unless they happen to check $? or are able to scroll back.

The suggested fix is to have make *always* print an error indication as the last line of its output if the build has failed.

Thanks,
Mike