Include more gvfs backends in the GNOME pkgset

Things I bumped into thus far: - gvfs-smb: for mounting SMB network shares - gvfs-mtp: for connecting Android phones over USB for file transfer Also things I see on my Fedora that may be relevant: - gvfs-afc: for iPhones (I don't have one so idk) - gvfs-afp: also something Apple-related (also idk) - gvfs-gphoto2: allegedly for PTP but it didn't work with my Android phone