Add diskscan package

packages/diskscan.rb

+require 'package'
+
+class Diskscan < Package
+  description 'diskscan is intended to find sectors of a storage medium (hard disk, flash drive or pendrive, etc.) which are bad or in the process of going bad.'
+  homepage 'https://github.com/baruch/diskscan'
+  version '0.19'
+  source_url 'https://github.com/baruch/diskscan/archive/0.19.tar.gz'
+  source_sha1 '74777d57af378fffe209086a026b788cd35d4d05'
+
+  depends_on 'cmake'
+  depends_on 'termcap'
+
+  def self.build
+    system "cmake ."
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+
+  def self.check
+    system "make", "check"
+  end
+end