gnu: Remove rust-ptree-0.4.

* gnu/packages/crates-io.scm (rust-ptree-0.4): Delete variable.

Change-Id: I9e9991438845b7c0a7c4f74d6956ba70127d55c5

gnu/packages/crates-io.scm

@@ -58988,36 +58988,6 @@ pointers:
     (description "This package provides macros for the ptr_meta API.")
     (license license:expat)))
 
-(define-public rust-ptree-0.4
-  (package
-    (name "rust-ptree")
-    (version "0.4.0")
-    (source
-     (origin
-       (method url-fetch)
-       (uri (crate-uri "ptree" version))
-       (file-name (string-append name "-" version ".tar.gz"))
-       (sha256
-        (base32 "0w72k0svlj8ihbf7m7ivay7rpv38xz9ad5a06isyqsiiddwq1pm0"))))
-    (build-system cargo-build-system)
-    (arguments
-     `(#:skip-build? #t
-       #:cargo-inputs
-       (("rust-ansi-term" ,rust-ansi-term-0.12)
-        ("rust-atty" ,rust-atty-0.2)
-        ("rust-config" ,rust-config-0.11)
-        ("rust-directories" ,rust-directories-4)
-        ("rust-petgraph" ,rust-petgraph-0.6)
-        ("rust-serde" ,rust-serde-1)
-        ("rust-serde-value" ,rust-serde-value-0.7)
-        ("rust-tint" ,rust-tint-1))))
-    (home-page "https://gitlab.com/Noughmad/ptree")
-    (synopsis "Pretty-print tree-like structures")
-    (description
-     "The @code{ptree} crate supports output formatting due to a user-provided
-configuration file and/or environment variables.")
-    (license (list license:expat license:asl2.0))))
-
 (define-public rust-ptyprocess-0.4
   (package
     (name "rust-ptyprocess")