Merge pull request #1250 from cstrouse/add-swig

Add swig package

packages/swig.rb

+require 'package'
+
+class Swig < Package
+  description 'Simplified Wrapper and Interface Generator'
+  homepage 'http://www.swig.org'
+  version '3.0.12'
+  source_url 'http://prdownloads.sourceforge.net/swig/swig-3.0.12.tar.gz'
+  source_sha256 '7cf9f447ae7ed1c51722efc45e7f14418d15d7a1e143ac9f09a668999f4fc94d'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  depends_on 'pcre'
+  depends_on 'zlibpkg'
+
+  def self.build
+    system "./configure --prefix=#{CREW_PREFIX} --libdir=#{CREW_LIB_PREFIX}"
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end