Add augeas package (#3568)

Augeas is a configuration file editing tool that parses the native format and
transforms it into a tree. This is a prerequiste package for libguestfs.

Tested on ARM.

packages/augeas.rb

+require 'package'
+
+class Augeas < Package
+  description 'Augeas is a configuration editing tool that parses native formats and transforms them into a tree.'
+  homepage 'http://augeas.net/'
+  version '1.12.0'
+  source_url 'http://download.augeas.net/augeas-1.12.0.tar.gz'
+  source_sha256 '321942c9cc32185e2e9cb72d0a70eea106635b50269075aca6714e3ec282cb87'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  def self.build
+    system './configure',
+             "--prefix=#{CREW_PREFIX}",
+             "--libdir=#{CREW_LIB_PREFIX}"
+    system 'make'
+  end
+
+  def self.install
+    system 'make', "DESTDIR=#{CREW_DEST_DIR}", 'install'
+  end
+end