Add cabextract package

packages/cabextract.rb

+require 'package'
+
+class Cabextract < Package
+  description 'cabextract is Free Software for extracting Microsoft cabinet files, also called .CAB files.'
+  homepage 'https://www.cabextract.org.uk/'
+  version '1.6'
+  source_url 'https://www.cabextract.org.uk/cabextract-1.6.tar.gz'
+  source_sha1 '64f6d5056d3e417a943648c23cb22218b7079ced'
+
+  def self.build
+    system './configure'
+    system 'make'
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end