automoc4: use patch DSL

Formula/automoc4.rb

@@ -8,12 +8,10 @@ class Automoc4 < Formula
   depends_on 'cmake' => :build
   depends_on 'qt'
 
-  def patches
   # Patch needed to find Qt in Homebrew upstreamed but upstream version
   # does not apply. Won't be needed for next version.
   # https://projects.kde.org/projects/kdesupport/automoc/repository/revisions/6b9597ff
-    { :p0 => DATA }
-  end
+  patch :p0, :DATA
 
   def install
     system "cmake", ".", *std_cmake_args