libmikmod: use options DSL

Signed-off-by: Jack Nagel <jacknagel@gmail.com>

Formula/libmikmod.rb

@@ -7,12 +7,10 @@ class Libmikmod < Formula
 
   depends_on :x11
 
-  def options
-    [[ '--with-debug', 'Enable debugging symbols']]
-  end
+  option 'with-debug', 'Enable debugging symbols'
 
   def install
-    if ARGV.include? '--with-debug' then
+    if build.include? 'with-debug'
       (ENV.compiler == :clang) ? ENV.Og : ENV.O2
     end
 
@@ -23,7 +21,7 @@ class Libmikmod < Formula
       --disable-sam9407
       --disable-ultra
     ]
-    args << '--with-debug' if ARGV.include? '--with-debug'
+    args << '--with-debug' if build.include? 'with-debug'
     mkdir 'macbuild' do
       system "../configure", *args
       system "make install"