Add ragel and a52 (#2786)

* Add ragel

* Add a52

* Update ragel.rb

packages/a52.rb

+require 'package'
+
+class A52 < Package
+  description 'liba52 is a free library for decoding ATSC A/52 streams.'
+  homepage 'http://liba52.sourceforge.net/'
+  version '0.7.4'
+  source_url 'http://liba52.sourceforge.net/files/a52dec-0.7.4.tar.gz'
+  source_sha256 'a21d724ab3b3933330194353687df82c475b5dfb997513eef4c25de6c865ec33'
+
+  def self.build
+    system "./bootstrap"
+    system "./configure --prefix=#{CREW_PREFIX} --libdir=#{CREW_LIB_PREFIX}"
+    system "make"
+  end
+
+  def self.install
+    system "make DESTDIR=#{CREW_DEST_DIR} install"
+  end
+end

packages/ragel.rb

+require 'package'
+
+class Ragel < Package
+  description 'Ragel compiles executable finite state machines from regular languages.'
+  homepage 'http://www.colm.net/open-source/ragel/'
+  version '6.10'
+  source_url 'https://www.colm.net/files/ragel/ragel-6.10.tar.gz'
+  source_sha256 '5f156edb65d20b856d638dd9ee2dfb43285914d9aa2b6ec779dac0270cd56c3f'
+
+  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