gnu: Add rust-cssparser-macros-0.3.

* gnu/packages/crates-io.scm (rust-cssparser-macros-0.3): New variable.

gnu/packages/crates-io.scm

@@ -3527,6 +3527,33 @@ intrinsics.")
 Code} (MAC) algorithms.")
     (license (list license:expat license:asl2.0))))
 
+(define-public rust-cssparser-macros-0.3
+  (package
+    (name "rust-cssparser-macros")
+    (version "0.3.6")
+    (source
+      (origin
+        (method url-fetch)
+        (uri (crate-uri "cssparser-macros" version))
+        (file-name
+         (string-append name "-" version ".tar.gz"))
+        (sha256
+         (base32
+          "1vqyc5xm8a4va92vs1nn0cc46c930l2n21gccijnc5y7hx7cicav"))))
+    (build-system cargo-build-system)
+    (arguments
+     `(#:cargo-inputs
+       (("rust-phf-codegen" ,rust-phf-codegen-0.7)
+        ("rust-proc-macro2" ,rust-proc-macro2-1.0)
+        ("rust-procedural-masquerade" ,rust-procedural-masquerade-0.1)
+        ("rust-quote" ,rust-quote-1.0)
+        ("rust-syn" ,rust-syn-1.0))))
+    (home-page "https://github.com/servo/rust-cssparser")
+    (synopsis "Procedural macros for cssparser")
+    (description
+     "This package provides the procedural macros for rust-cssparser.")
+    (license license:mpl2.0)))
+
 (define-public rust-csv-1.1
   (package
     (name "rust-csv")