android-repo-download: Add guile-json extension.

This partially fixes: <https://issues.guix.gnu.org/48152>.

The (guix build download-nar) module drags the (guix build download) module
that autoloads (guix swh).

[13/26] Loading './guix/swh.scm'...
;;; Failed to autoload swh-download-directory in (guix swh):
;;; no code for module (json)
Backtrace:
In srfi/srfi-1.scm:
   460:18 19 (fold #<procedure 7ffff2c50760 at ice-9/eval.scm:336:1?> ?)
In ice-9/eval.scm:
    619:8 18 (_ #(#(#<directory (guix build utils) 7ffff318fd20>) # ?))
In ice-9/boot-9.scm:
   2806:4 17 (save-module-excursion #<procedure 7ffff25b1a00 at ice-?>)
In unknown file:
          16 (primitive-load "./guix/swh.scm")
In ice-9/eval.scm:
   721:20 15 (primitive-eval (define-module (guix swh) #:use-module ?))
In ice-9/psyntax.scm:
  1241:36 14 (expand-top-sequence ((define-module (guix swh) # # ?)) ?)
  1233:19 13 (parse _ (("placeholder" placeholder)) ((top) #(# # ?)) ?)
   285:10 12 (parse _ (("placeholder" placeholder)) (()) _ c&e (eval) ?)
In ice-9/eval.scm:
   293:34 11 (_ #<directory (guix build utils) 7ffff318fd20>)
In ice-9/boot-9.scm:
   3380:4 10 (define-module* _ #:filename _ #:pure _ #:version _ # _ ?)
  2565:24  9 (call-with-deferred-observers #<procedure 7ffff2215230 ?>)
  3393:24  8 (_)
   222:29  7 (map1 (((guix base16)) ((guix build utils)) ((# ?) ?) ?))
   222:29  6 (map1 (((guix build utils)) ((guix build syscalls) ?) ?))
   222:29  5 (map1 (((guix build syscalls) #:select (mkdtemp!)) (#) ?))
   222:29  4 (map1 (((web uri)) ((web client)) ((web response)) (#) ?))
   222:29  3 (map1 (((web client)) ((web response)) ((json)) ((?)) ?))
   222:29  2 (map1 (((web response)) ((json)) ((srfi srfi-1)) ((?)) ?))
   222:17  1 (map1 (((json)) ((srfi srfi-1)) ((srfi srfi-9)) ((?)) ?))
   3300:6  0 (resolve-interface (json) #:select _ #:hide _ #:prefix _ ?)

ice-9/boot-9.scm:3300:6: In procedure resolve-interface:
no code for module (json)

* guix/android-repo-download.scm (android-repo-fetch): Add guile-json
extension.

guix/android-repo-download.scm

@@ -78,6 +78,9 @@ generic name if unset."
   (define zlib
     (module-ref (resolve-interface '(gnu packages compression)) 'zlib))
 
+  (define guile-json
+    (module-ref (resolve-interface '(gnu packages guile)) 'guile-json-4))
+
   (define gnutls
     (module-ref (resolve-interface '(gnu packages tls)) 'gnutls))
 
@@ -99,7 +102,7 @@ generic name if unset."
 
   (define build
     (with-imported-modules modules
-      (with-extensions (list gnutls)
+      (with-extensions (list gnutls guile-json) ;for (guix swh)
         #~(begin
             (use-modules (guix build android-repo)
                          (guix build utils)