Enforce 'rdev' (device file major/minor) is 0

Historically OSTree supported device files, but it wasn't useful, and
added attack surface.  Support was removed in

https://git.gnome.org/browse/ostree/commit/?id=62a896350bd54bff5a9413d2ee0fad7ff4364f9a

Perform a further cleanup by enforcing internally that the device
major/minor must be 0.

Conflicts:
	src/libostree/ostree-core.c

src/libostree/ostree-repo-libarchive.c

@@ -67,10 +67,6 @@ file_info_from_archive_entry_and_modifier (OstreeRepo *repo,
     {
       g_file_info_set_attribute_byte_string (info, "standard::symlink-target", archive_entry_symlink (entry));
     }
-  else if (file_type == G_FILE_TYPE_SPECIAL)
-    {
-      g_file_info_set_attribute_uint32 (info, "unix::rdev", st->st_rdev);
-    }
 
   _ostree_repo_commit_modifier_apply (repo, modifier,
                                       archive_entry_pathname (entry),