ignore trailing slash for `guix gc -d' /gnu/store/...something/

Package: guix Version: 0.8.1 When I invoke `guix gc -d /path', success of the command depends whether /path ends with slash or not: $ guix gc -d /gnu/store/mgqk0kv5jckrd7l5cwj68fp7cz2l4qqj-luajit-2.0.3/ guix gc: error: build failed: path `/gnu/store/mgqk0kv5jckrd7l5cwj68fp7cz2l4qqj-luajit-2.0.

missing input and more

Hi Guix, during my packaging attempts of connman (which looks good so far) I found that gnutls is missing "install-time" dependency - zlib. 1] ldd shows run-time dependency: $ ldd /gnu/store/0mfgwxgqyhlvi5xyi1j2lbr3ygczsdyp-gnutls-3.2.21/lib/libgnutls.so | grep libz libz.so.1 => /gnu/s