gnu: age: Move to (gnu packages golang-crypto).

This is a follow-up to c94fc0596f, which
introduces cyclic module dependencies.

* gnu/packages/golang.scm (age): Move to…
* gnu/packages/golang-crypto.scm (age): …here.

Change-Id: I471ea739315cb052ed61c69ad52906c5c46852f5

gnu/packages/golang-crypto.scm

@@ -84,6 +84,15 @@ 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/golang.scm

@@ -9347,15 +9347,6 @@ configuration languages, but other uses may be possible too.")
     (description "This package implements a low-level key/value store in Go.")
     (license license:expat)))
 
-(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 age-keygen
   (package
     (inherit go-filippo-io-age)