Add wdiff package

Add pre-built binaries

Add check block

packages/wdiff.rb

+require 'package'
+
+class Wdiff < Package
+  description 'The GNU wdiff program is a front end to diff for comparing files on a word per word basis.'
+  homepage 'https://www.gnu.org/software/wdiff/'
+  version '1.2.2'
+  source_url 'https://ftpmirror.gnu.org/wdiff/wdiff-1.2.2.tar.gz'
+  source_sha256 '34ff698c870c87e6e47a838eeaaae729fa73349139fc8db12211d2a22b78af6b'
+
+  binary_url ({
+    aarch64: 'https://dl.bintray.com/chromebrew/chromebrew/wdiff-1.2.2-chromeos-armv7l.tar.xz',
+     armv7l: 'https://dl.bintray.com/chromebrew/chromebrew/wdiff-1.2.2-chromeos-armv7l.tar.xz',
+       i686: 'https://dl.bintray.com/chromebrew/chromebrew/wdiff-1.2.2-chromeos-i686.tar.xz',
+     x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/wdiff-1.2.2-chromeos-x86_64.tar.xz',
+  })
+  binary_sha256 ({
+    aarch64: 'e27cdc3a13508098ddb9e330758896596af712fb33ac4f6c5c17c1b41624ffa1',
+     armv7l: 'e27cdc3a13508098ddb9e330758896596af712fb33ac4f6c5c17c1b41624ffa1',
+       i686: '0e6c8306a0fe4ddff4b03ee541f1ffbaa92af829dac9d9681af9e6e6e381952a',
+     x86_64: '091e34045534f4f777172e1f4a3c9e966377efa9158304f1bb15f31a3edc2dac',
+  })
+
+  depends_on 'texinfo'
+
+  def self.build
+    system "./configure --prefix=#{CREW_PREFIX}"
+    system 'make'
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+
+  def self.check
+    system "make", "check"
+  end
+end