gnu: Add rust-smallvec-0.2.

* gnu/packages/crates-io.scm (rust-smallvec-0.2): New variable.

gnu/packages/crates-io.scm

@@ -34017,6 +34017,21 @@ stack.")
        #:cargo-development-inputs
        (("rust-bincode" ,rust-bincode-1))))))
 
+(define-public rust-smallvec-0.2
+  (package
+    (inherit rust-smallvec-1)
+    (name "rust-smallvec")
+    (version "0.2.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "smallvec" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "04z0bv5pcnwnvij8kfzw56lnib9mjq8bafp120i7q48yvzbbr32c"))))
+    (build-system cargo-build-system)
+    (arguments `(#:skip-build? #t))))
+
 (define-public rust-smol-0.1
   (package
     (name "rust-smol")