added autoconf-archive package

packages/autoconf_archive.rb

+require 'package'
+
+class Autoconf_archive < Package
+  version '2017-03-21'
+  source_url 'https://ftp.wrz.de/pub/gnu/autoconf-archive/autoconf-archive-2017.03.21.tar.xz'
+  source_sha1 '93483641babea959e4a307a808cbd74fb9e90d58'
+
+  depends_on 'perl'
+  depends_on 'm4'
+  depends_on 'autoconf'
+
+  def self.build
+    system "./configure"
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end