lilypond: specify fontforge build options

Closes Homebrew/homebrew#15437.

Formula/lilypond.rb

@@ -8,15 +8,15 @@ class Lilypond < Formula
   option 'with-doc', "Build documentation in addition to binaries (may require several hours)."
 
   depends_on :tex
+  depends_on :x11
   depends_on 'pkg-config' => :build
   depends_on 'gettext'
   depends_on 'pango'
   depends_on 'guile'
   depends_on 'ghostscript'
   depends_on 'mftrace'
-  depends_on 'fontforge'
+  depends_on 'fontforge' => ["with-x", "with-cairo"]
   depends_on 'texinfo'
-  depends_on :x11
 
   # Assert documentation dependencies if requested.
   if build.include? 'with-doc'
@@ -28,13 +28,14 @@ class Lilypond < Formula
   end
 
   fails_with :clang do
-    build 421
+    build 425
     cause 'Strict C99 compliance error in a pointer conversion.'
   end
 
   def install
     gs = Formula.factory('ghostscript')
-    system "./configure", "--prefix=#{prefix}", "--enable-rpath",
+    system "./configure", "--prefix=#{prefix}",
+                          "--enable-rpath",
                           "--with-ncsb-dir=#{gs.share}/ghostscript/fonts/"
 
     # Separate steps to ensure that lilypond's custom fonts are created.