gnu: Add rust-libsqlite3-sys-0.20.

* gnu/packages/crates-io.scm (rust-libsqlite3-sys-0.20): New variable,
  skipping build.
  (rust-libsqlite3-sys-0.15): Inherit from rust-libsqlite3-sys-0.20.

gnu/packages/crates-io.scm

@@ -14085,8 +14085,36 @@ file.
 @end itemize")
     (license license:gpl2+)))
 
+(define-public rust-libsqlite3-sys-0.20
+  (package
+    (name "rust-libsqlite3-sys")
+    (version "0.20.1")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (crate-uri "libsqlite3-sys" version))
+       (file-name (string-append name "-" version ".tar.gz"))
+       (sha256
+        (base32 "1g9gbjjpm9phhs991abkzmacszibp94m5nrh331ycd99y9ci1lv4"))))
+    (build-system cargo-build-system)
+    (inputs
+     `(("sqlite" ,sqlite)))
+    (arguments
+     `(#:skip-build? #t
+       #:cargo-inputs
+       ;; build dependencies
+       (("rust-bindgen" ,rust-bindgen-0.55)
+        ("rust-cc" ,rust-cc-1)
+        ("rust-pkg-config" ,rust-pkg-config-0.3)
+        ("rust-vcpkg" ,rust-vcpkg-0.2))))
+    (home-page "https://github.com/rusqlite/rusqlite")
+    (synopsis "Native bindings to the libsqlite3 library")
+    (description "Native bindings to the libsqlite3 library")
+    (license license:expat)))
+
 (define-public rust-libsqlite3-sys-0.15
   (package
+    (inherit rust-libsqlite3-sys-0.20)
     (name "rust-libsqlite3-sys")
     (version "0.15.0")
     (source
@@ -14105,11 +14133,7 @@ file.
        (("rust-bindgen" ,rust-bindgen-0.49)
         ("rust-cc" ,rust-cc-1)
         ("rust-pkg-config" ,rust-pkg-config-0.3)
-        ("rust-vcpkg" ,rust-vcpkg-0.2))))
-    (home-page "https://github.com/rusqlite/rusqlite")
-    (synopsis "Native bindings to the libsqlite3 library")
-    (description "Native bindings to the libsqlite3 library")
-    (license license:expat)))
+        ("rust-vcpkg" ,rust-vcpkg-0.2))))))
 
 (define-public rust-libz-sys-1
   (package