vorbis-tools: remove options

Formula/vorbis-tools.rb

@@ -3,7 +3,7 @@ class VorbisTools < Formula
   homepage "https://github.com/xiph/vorbis-tools"
   url "https://downloads.xiph.org/releases/vorbis/vorbis-tools-1.4.0.tar.gz"
   sha256 "a389395baa43f8e5a796c99daf62397e435a7e73531c9f44d9084055a05d22bc"
-  revision 1
+  revision 2
 
   bottle do
     rebuild 1
@@ -15,10 +15,10 @@ class VorbisTools < Formula
   end
 
   depends_on "pkg-config" => :build
+  depends_on "flac"
   depends_on "libao"
   depends_on "libogg"
   depends_on "libvorbis"
-  depends_on "flac" => :optional
 
   def install
     # Fix `brew linkage --test` "Missing libraries: /usr/lib/libnetwork.dylib"
@@ -32,8 +32,6 @@ class VorbisTools < Formula
       --prefix=#{prefix}
     ]
 
-    args << "--without-flac" if build.without? "flac"
-
     system "./configure", *args
     system "make", "install"
   end