gzip: Use fts_path instead of fts_name to get full path on messages

[ricardobranco777]

The handle_dir() function should pass fts_path and not fts_name because the latter is the basename(3). Because of this, not just verbose output but error messages as well are ambiguous when files with the same name exist.

To reproduce:

$ mkdir /tmp/x /tmp/y
$ cp /etc/services /tmp/x
$ cp /etc/services /tmp/y
$ chmod 000 /tmp/x/services
$ gzip -vr /tmp/x /tmp/y
gzip: can't open services: Permission denied
services:          86.1% -- replaced with services.gz

With patch:

gzip: can't open /tmp/x/services: Permission denied
/tmp/y/services:	   86.1% -- replaced with /tmp/y/services.gz

Fixed in FreeBSD: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=114470