uucore: add missing declarations

Author: sylvestre

src/uucore/Cargo.toml

@@ -86,7 +86,7 @@ fsxattr = ["xattr"]
 lines = []
 format = ["itertools", "quoting-style"]
 mode = ["libc"]
-perms = ["libc", "walkdir"]
+perms = ["entries", "libc", "walkdir"]
 buf-copy = []
 pipes = []
 process = ["libc"]