Change diffutils.rb to strip binary and add check method

packages/diffutils.rb

 require 'package'
 
 class Diffutils < Package
-  version '3.5'
+  version '3.5-1'
   source_url 'ftp://ftp.gnu.org/gnu/diffutils/diffutils-3.5.tar.xz'
   source_sha1 '1169cce8eaaf7290dc087d65db7ed75de0dceb93'
 
@@ -13,6 +13,10 @@ class Diffutils < Package
   end
 
   def self.install
-    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install-strip"
+  end
+
+  def self.check
+    system "make", "check"
   end
 end