gd: make some deps recommended

Formula/gd.rb

@@ -4,7 +4,7 @@ class Gd < Formula
   homepage 'http://libgd.bitbucket.org/'
   url 'https://bitbucket.org/libgd/gd-libgd/downloads/libgd-2.1.0.tar.gz'
   sha1 'a0f3053724403aef9e126f4aa5c662573e5836cd'
-  revision 1
+  revision 2
 
   bottle do
     cellar :any
@@ -19,9 +19,9 @@ class Gd < Formula
 
   depends_on 'libpng' => :recommended
   depends_on 'jpeg' => :recommended
-  depends_on 'fontconfig' => :optional
-  depends_on 'freetype' => :optional
-  depends_on 'libtiff' => :optional
+  depends_on 'fontconfig' => :recommended
+  depends_on 'freetype' => :recommended
+  depends_on 'libtiff' => :recommended
   depends_on 'libvpx' => :optional
 
   fails_with :llvm do