download, git: Refer to the right module in 'module-use!' call.

This fixes a regression introduced in
6a7c4636.

* guix/build/download.scm (load-gnutls): Call 'resolve-module' instead
of 'current-module'.
* guix/git.scm (load-git-submodules): Likewise.

guix/build/download.scm

@@ -158,7 +158,8 @@ (define* (ftp-fetch uri file #:key timeout print-build-trace?)
 (define (load-gnutls)
   ;; XXX: Use this hack instead of #:autoload to avoid compilation errors.
   ;; See <http://bugs.gnu.org/12202>.
-  (module-use! (current-module) (resolve-interface '(gnutls)))
+  (module-use! (resolve-module '(guix build download))
+               (resolve-interface '(gnutls)))
   (set! load-gnutls (const #t)))
 
 (define %x509-certificate-directory

guix/git.scm

@@ -203,7 +203,7 @@ (define (load-git-submodules)
      (set! load-git-submodules (const #f))
      #f)
     (iface
-     (module-use! (current-module) iface)
+     (module-use! (resolve-module '(guix git)) iface)
      (set! load-git-submodules (const #t))
      #t)))