Update xxhash from 0.7.2 to 0.7.3 (#3982)

Tested on ARM.

packages/xxhash.rb

@@ -3,21 +3,13 @@ require 'package'
 class Xxhash < Package
   description 'xxHash is an extremely fast non-cryptographic hash algorithm, working at speeds close to RAM limits.'
   homepage 'https://cyan4973.github.io/xxHash/'
-  version '0.7.2'
-  source_url 'https://github.com/Cyan4973/xxHash/archive/v0.7.2.tar.gz'
-  source_sha256 '7e93d28e81c3e95ff07674a400001d0cdf23b7842d49b211e5582d00d8e3ac3e'
+  version '0.7.3'
+  source_url 'https://github.com/Cyan4973/xxHash/archive/v0.7.3.tar.gz'
+  source_sha256 '952ebbf5b11fbf59ae5d760a562d1e9112278f244340ad7714e8556cbe54f7f7'
 
   binary_url ({
-    aarch64: 'https://dl.bintray.com/chromebrew/chromebrew/xxhash-0.7.2-chromeos-armv7l.tar.xz',
-     armv7l: 'https://dl.bintray.com/chromebrew/chromebrew/xxhash-0.7.2-chromeos-armv7l.tar.xz',
-       i686: 'https://dl.bintray.com/chromebrew/chromebrew/xxhash-0.7.2-chromeos-i686.tar.xz',
-     x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/xxhash-0.7.2-chromeos-x86_64.tar.xz',
   })
   binary_sha256 ({
-    aarch64: '13b8a0673cc01d5c84196dbe821e905acfa8057ad2a44804dbe9169eda8039ea',
-     armv7l: '13b8a0673cc01d5c84196dbe821e905acfa8057ad2a44804dbe9169eda8039ea',
-       i686: '27202803f014e22ab41ca0729adeb618c4bae2c6710773a0a77e81357743eb64',
-     x86_64: '12e1f37a20e71fb5b6e685136c547ee0eff33d13457b459a67636bdd21f609ec',
   })
 
   def self.build