gnu: font-comic-neue: Use 'font-build-system'.

* gnu/packages/fonts.scm (font-comic-neue): Switch to 'font-build-system'.
Re-indent.
[source]: Use url-fetch/zipbomb.
[native-inputs]: Remove dependency on unzip.

Signed-off-by: Arun Isaac <arunisaac@systemreboot.net>

gnu/packages/fonts.scm

@@ -1111,30 +1111,20 @@ later hand-tweaked with the gbdfed(1) editor:
     (name "font-comic-neue")
     (version "2.3")
     (source (origin
-            (method url-fetch)
+              (method url-fetch/zipbomb)
               (uri (string-append
                     "http://www.comicneue.com/comic-neue-" version ".zip"))
               (sha256
                (base32
                 "1695hkpd8kqnr2a88p8xs496slgzxjjkzpa9aa33ml3pnh7519zk"))))
-   (build-system trivial-build-system)
+    (build-system font-build-system)
     (arguments
-    `(#:modules ((guix build utils))
+     `(#:phases
-      #:builder (begin
+       (modify-phases %standard-phases
-                  (use-modules (guix build utils))
+         (add-before 'install 'chdir
-                  (let ((font-dir (string-append %output
+           (lambda _
-                                                 "/share/fonts/truetype"))
+             (chdir "Web")
-                        (source (assoc-ref %build-inputs "source"))
+             #t)))))
-                        (unzip  (string-append (assoc-ref %build-inputs "unzip")
-                                               "/bin/unzip")))
-                    (mkdir-p font-dir)
-                    (system* unzip source)
-                    (with-directory-excursion
-                     (string-append "Web")
-                     (for-each (lambda (ttf)
-                                 (install-file ttf font-dir))
-                               (find-files "." "\\.ttf$")))))))
-   (native-inputs `(("unzip" ,unzip)))
     (home-page "http://www.comicneue.com/")
     (synopsis "Font that fixes the shortcomings of Comic Sans")
     (description