gnu: Remove rust-log-mdc-0.1.

* gnu/packages/crates-io.scm (rust-log-mdc-0.1): Delete variable.

gnu/packages/crates-io.scm

@@ -30948,25 +30948,6 @@ by inspecting the system for user preference.")
      `(#:cargo-inputs
        (("rust-log" ,rust-log-0.4))))))
 
-(define-public rust-log-mdc-0.1
-  (package
-    (name "rust-log-mdc")
-    (version "0.1.0")
-    (source
-     (origin
-       (method url-fetch)
-       (uri (crate-uri "log-mdc" version))
-       (file-name
-        (string-append name "-" version ".tar.gz"))
-       (sha256
-        (base32 "1iw1x3qhjvrac35spikn5h06a1rxd9vw216jk8h52jhz9i0j2kd9"))))
-    (build-system cargo-build-system)
-    (home-page "https://github.com/sfackler/rust-log-mdc")
-    (synopsis "Mapped diagnostic context (MDC) for use with the `log` crate")
-    (description "This package provides a mapped diagnostic context (MDC) for
-use with the `log` crate.")
-    (license (list license:expat license:asl2.0))))
-
 (define-public rust-loom-0.5
   (package
     (name "rust-loom")