Add re2c package (#3172)

Add pre-built binaries

packages/re2c.rb

+require 'package'
+
+class Re2c < Package
+  description 're2c is a free and open-source lexer generator for C and C++.'
+  homepage 'http://re2c.org/'
+  version '1.1.1'
+  source_url 'https://github.com/skvadrik/re2c/releases/download/1.1.1/re2c-1.1.1.tar.gz'
+  source_sha256 '856597337ea00b24ce91f549f79e6eece1b92ba5f8b63292cad66c14ac7451cf'
+
+  binary_url ({
+    aarch64: 'https://dl.bintray.com/chromebrew/chromebrew/re2c-1.1.1-chromeos-armv7l.tar.xz',
+     armv7l: 'https://dl.bintray.com/chromebrew/chromebrew/re2c-1.1.1-chromeos-armv7l.tar.xz',
+       i686: 'https://dl.bintray.com/chromebrew/chromebrew/re2c-1.1.1-chromeos-i686.tar.xz',
+     x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/re2c-1.1.1-chromeos-x86_64.tar.xz',
+  })
+  binary_sha256 ({
+    aarch64: 'e0afdfb419024f81bf62dd338ba6e80ef9a04abc83b8b4c1fd956ca6beed0902',
+     armv7l: 'e0afdfb419024f81bf62dd338ba6e80ef9a04abc83b8b4c1fd956ca6beed0902',
+       i686: '159d7224aac0c6649afb531f17d420a51a459ba1354ec91f6f9e1ca5f5d6f31c',
+     x86_64: 'f1d91e37777b18324aea0e6dcad7927c50aed93daa91be6118a7760eebfa5b7a',
+  })
+
+  def self.build
+    system "./configure --prefix=#{CREW_PREFIX}"
+    system 'make'
+    system 'make bootstrap'
+  end
+
+  def self.check
+    system 'make check'
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end