Add abcde package

packages/abcde.rb

+require 'package'
+
+class Abcde < Package
+  description 'Grab an entire CD and compress it to Ogg/Vorbis, MP3, FLAC, AAC, Ogg/Speex and/or MPP/MP+(Musepack) format.'
+  homepage 'https://abcde.einval.com/wiki/'
+  version '2.8.1'
+  source_url 'https://abcde.einval.com/download/abcde-2.8.1.tar.gz'
+  source_sha256 'e49c71d7ddcd312dcc819c3be203abd3d09d286500ee777cde434c7881962b39'
+
+  binary_url ({
+  })
+  binary_sha256 ({
+  })
+
+  def self.build
+    system "sed -i 's,prefix = /usr/local,prefix = #{CREW_DEST_PREFIX},' Makefile"
+    system "sed -i 's,sysconfdir = /etc,sysconfdir = #{CREW_DEST_PREFIX}/etc,' Makefile"
+  end
+
+  def self.install
+    system "make install"
+  end
+end