Add librhash package

Add header files

Add pre-built binaries

packages/librhash.rb

+require 'package'
+
+class Librhash < Package
+  description 'RHash is a console utility for computing and verifying hash sums of files.'
+  homepage 'http://rhash.anz.ru/'
+  version '1.3.6'
+  source_url 'https://github.com/rhash/RHash/archive/v1.3.6.tar.gz'
+  source_sha256 '964df972b60569b5cb35ec989ced195ab8ea514fc46a74eab98e86569ffbcf92'
+
+  binary_url ({
+    aarch64: 'https://dl.bintray.com/chromebrew/chromebrew/librhash-1.3.6-chromeos-armv7l.tar.xz',
+     armv7l: 'https://dl.bintray.com/chromebrew/chromebrew/librhash-1.3.6-chromeos-armv7l.tar.xz',
+       i686: 'https://dl.bintray.com/chromebrew/chromebrew/librhash-1.3.6-chromeos-i686.tar.xz',
+     x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/librhash-1.3.6-chromeos-x86_64.tar.xz',
+  })
+  binary_sha256 ({
+    aarch64: 'dcf9b61860e8a0994f99dc9fbb05d811f1b74cff29eaa22c0303ed910ecb2363',
+     armv7l: 'dcf9b61860e8a0994f99dc9fbb05d811f1b74cff29eaa22c0303ed910ecb2363',
+       i686: '8df3d5dd347071cb6bdc75aa1b78cbd45449c09785a1131d9a22001f3f8cedf4',
+     x86_64: 'c6b8682b1caec42d5146f2864c3d8ea608d1fcdbe638d60897e1e074a3f034a2',
+  })
+
+  def self.build
+    system "./configure --prefix=#{CREW_PREFIX} --libdir=#{CREW_LIB_PREFIX}"
+    system 'make'
+  end
+
+  def self.install
+    FileUtils.mkdir_p "#{CREW_DEST_PREFIX}/include/librhash"
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+    system "cp librhash/*.h #{CREW_DEST_PREFIX}/include/librhash"
+  end
+end