gnu: vim-guix-vim: Use copy-build-system.

* gnu/packages/vim.scm (vim-guix-vim)[build-system]: Switch to
copy-build-system.
[arguments]: Adjust accordingly.

gnu/packages/vim.scm

@@ -834,22 +834,15 @@ through its msgpack-rpc API.")
               (sha256
                (base32
                 "1f8h8m96fqh3f9hy87spgh9kdqzyxl11n9s3rywvyq5xhn489bnk"))))
-    (build-system gnu-build-system)
+    (build-system copy-build-system)
     (arguments
-     '(#:tests? #f
-       #:phases
-       (modify-phases %standard-phases
-         (delete 'configure)
-         (delete 'build)
-         (replace 'install
-           (lambda* (#:key outputs #:allow-other-keys)
-             (let* ((out (assoc-ref outputs "out"))
-                    (vimfiles (string-append out "/share/vim/vimfiles")))
-               (for-each
-                 (lambda (dir)
-                   (copy-recursively dir (string-append vimfiles "/" dir)))
-                 '("compiler" "doc" "indent" "ftdetect" "ftplugin" "syntax"))
-               #t))))))
+     '(#:install-plan
+       '(("compiler" "share/vim/vimfiles/")
+         ("doc" "share/vim/vimfiles/")
+         ("indent" "share/vim/vimfiles/")
+         ("ftdetect" "share/vim/vimfiles/")
+         ("ftplugin" "share/vim/vimfiles/")
+         ("syntax" "share/vim/vimfiles/"))))
     (home-page "https://gitlab.com/Efraim/guix.vim")
     (synopsis "Guix integration in Vim")
     (description "This package provides support for GNU Guix in Vim.")