gnu: Add go-filippo-io-age.

* gnu/packages/password-utils.scm (age): Move from here…
* gnu/packages/golang.scm (age): …to here, and inherit from…
(go-filippo-io-age): …this new source-only package variable.

gnu/packages/golang.scm

@@ -8366,6 +8366,44 @@ (define-public go-etcd-io-bbolt
     (description "This package implements a low-level key/value store in Go.")
     (license license:expat)))
 
+(define-public go-filippo-io-age
+  (package
+    (name "go-filippo-io-age")
+    (version "1.0.0")
+    (source
+     (origin
+       (method git-fetch)
+       (uri (git-reference
+             (url "https://github.com/FiloSottile/age")
+             (commit (string-append "v" version))))
+       (file-name (git-file-name name version))
+       (sha256
+        (base32 "19fz68n262kvg2ssw4r6nik30zk6g6cy7rdi0fm05czwigqrdz1i"))))
+    (build-system go-build-system)
+    (arguments `(#:import-path "filippo.io/age"))
+    (inputs
+     (list go-golang-org-x-sys
+           go-golang-org-x-term
+           go-golang-org-x-crypto
+           go-filippo-io-edwards25519))
+    (home-page "https://filippo.io/age")
+    (synopsis "Secure file encryption tool, format, and Go library")
+    (description
+     "This package implements file encryption according to the
+@{age-encryption.org/v1, https://age-encryption.org/v1} specification.
+It features small explicit keys, no configuration options, and Unix-style
+composability.")
+    (license license:bsd-3)))
+
+(define-public age
+  (package
+    (inherit go-filippo-io-age)
+    (name "age")
+    (arguments
+     `(#:import-path "filippo.io/age/cmd/age"
+       #:unpack-path "filippo.io/age"
+       #:install-source? #f))))
+
 (define-public go-filippo-io-edwards25519
   (package
     (name "go-filippo-io-edwards25519")

gnu/packages/password-utils.scm

@@ -116,35 +116,6 @@ (define-module (gnu packages password-utils)
   #:use-module (gnu packages xorg)
   #:use-module (gnu packages xml))
 
-(define-public age
-  (package
-    (name "age")
-    (version "1.0.0")
-    (source
-     (origin
-       (method git-fetch)
-       (uri (git-reference
-             (url "https://github.com/FiloSottile/age")
-             (commit (string-append "v" version))))
-       (file-name (git-file-name name version))
-       (sha256
-        (base32 "19fz68n262kvg2ssw4r6nik30zk6g6cy7rdi0fm05czwigqrdz1i"))))
-    (build-system go-build-system)
-    (arguments `(#:import-path "filippo.io/age"))
-    (inputs
-     (list go-golang-org-x-sys
-           go-golang-org-x-term
-           go-golang-org-x-crypto
-           go-filippo-io-edwards25519))
-    (home-page "https://filippo.io/age")
-    (synopsis "Secure file encryption tool, format, and Go library")
-    (description
-     "This package implements file encryption according to the
-@{age-encryption.org/v1, https://age-encryption.org/v1} specification.
-It features small explicit keys, no configuration options, and Unix-style
-composability.")
-    (license license:bsd-3)))
-
 (define-public pwgen
   (package
     (name "pwgen")