Merge pull request #841 from uberhacker/add-help2man-package

Add help2man package

packages/help2man.rb

+require 'package'
+
+class Help2man < Package
+  description "help2man produces simple manual pages from the '--help' and '--version' output of other commands."
+  homepage 'https://www.gnu.org/software/help2man/'
+  version '1.47.4'
+  source_url 'https://ftpmirror.gnu.org/help2man/help2man-1.47.4.tar.xz'
+  source_sha256 'd4ecf697d13f14dd1a78c5995f06459bff706fd1ce593d1c02d81667c0207753'
+
+  def self.build
+    system './configure'
+    system 'make'
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end