gnu: guix-daemon: Add dependency on Guile-JSON.

Fixes a bug introduced in 6776af04d4,
where the configure phase of 'guix-daemon' would abort due to the lack
of Guile-JSON.

* gnu/packages/package-management.scm (guix-daemon)[inputs]: Add
GUILE-JSON.

gnu/packages/package-management.scm

@@ -316,6 +316,7 @@ the Nix package manager.")
     (inputs
      `(("gnutls" ,gnutls)
        ("guile-git" ,guile-git)
+       ("guile-json" ,guile-json)
        ("guile-gcrypt" ,guile-gcrypt)
        ,@(fold alist-delete (package-inputs guix)
                '("boot-guile" "boot-guile/i686" "util-linux"))))