swig@3.04: Remove unmaintained formula

Formula/swig@3.04.rb

@@ -1,49 +0,0 @@
-class SwigAT304 < Formula
-  desc "Generate scripting interfaces to C/C++ code"
-  homepage "http://www.swig.org/"
-  url "https://downloads.sourceforge.net/project/swig/swig/swig-3.0.4/swig-3.0.4.tar.gz"
-  sha256 "410ffa80ef5535244b500933d70c1b65206333b546ca5a6c89373afb65413795"
-
-  bottle do
-    sha256 "264a8dc6653c2fc3ae88f1b0a8d60aef2b54db681b4fce4ce783b4f73f6daa84" => :mojave
-    sha256 "fa6edd5df156b7a985bfe6f74f56cf15682af6b01d11f0ed342f2f05444234f0" => :high_sierra
-    sha256 "51b8115c0a2813caf115fb5f082e7aa1b84b7c51acec70822b8619e918969a14" => :sierra
-    sha256 "84988480f25dea3fce15b6ca0e9a3322222cc473066f23626d59b20001574fdf" => :el_capitan
-    sha256 "f5e5251fa5d8f6ce3a7e63c9f3762ccd3bbc49f4664d1d781b71425992c2425b" => :yosemite
-  end
-
-  keg_only :versioned_formula
-
-  depends_on "pcre"
-
-  def install
-    system "./configure", "--disable-dependency-tracking",
-                          "--prefix=#{prefix}"
-    system "make"
-    system "make", "install"
-  end
-
-  test do
-    (testpath/"test.c").write <<~EOS
-      int add(int x, int y)
-      {
-        return x + y;
-      }
-    EOS
-    (testpath/"test.i").write <<~EOS
-      %module test
-      %inline %{
-      extern int add(int x, int y);
-      %}
-    EOS
-    (testpath/"run.rb").write <<~EOS
-      require "./test"
-      puts Test.add(1, 1)
-    EOS
-    system "#{bin}/swig", "-ruby", "test.i"
-    system ENV.cc, "-c", "test.c"
-    system ENV.cc, "-c", "test_wrap.c", "-I#{MacOS.sdk_path}/System/Library/Frameworks/Ruby.framework/Headers/"
-    system ENV.cc, "-bundle", "-flat_namespace", "-undefined", "suppress", "test.o", "test_wrap.o", "-o", "test.bundle"
-    assert_equal "2", shell_output("/usr/bin/ruby run.rb").strip
-  end
-end