cp: "cannot overwrite non-directory" errors differ from GNU

[abendrothj]

When a recursive copy meets a non-directory where it needs a directory, the error differs from GNU (uutils at 5f3aa7b, GNU 9.12 built from source):

setup	command	GNU	uutils
dst is a file	cp -r src dst	cannot overwrite non-directory 'dst' with directory 'src'	cannot overwrite non-directory with directory
src/sub is a directory, d/sub a file	cp -r src/. d	cannot overwrite non-directory 'd/./sub' with directory 'src/./sub'	cannot create regular file 'd/sub/x': Not a directory

Both fail and leave the file untouched; only the message differs. uutils drops the names in the first case and reports a later step in the second.

[xtqqczze]

@abendrothj In general, please check against the latest GNU version, preferably by building from source, or at least GNU 9.12 binaries.

[abendrothj]

Rechecked against GNU 9.12 built from the release tarball: both messages are identical to the 9.1 output in the table, and uutils main (5f3aa7b7f) still differs in the same way. I've updated the version in the description.