Add Xhost package (#3082)

Tests are useless; they do nothing.

Add pre-built binary

packages/xhost.rb

+require 'package'
+
+class Xhost < Package
+  description 'Server access control program for X'
+  homepage 'https://www.x.org/archive/X11R6.8.1/doc/xhost.1.html'
+  version '1.0.7'
+  source_url 'https://www.x.org/releases/individual/app/xhost-1.0.7.tar.bz2'
+  source_sha256 '93e619ee15471f576cfb30c663e18f5bc70aca577a63d2c2c03f006a7837c29a'
+
+  binary_url ({
+     x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/xhost-1.0.7-chromeos-x86_64.tar.xz',
+  })
+  binary_sha256 ({
+     x86_64: 'a9efe55993274542bd7cf8f9cc5dd9cd4899396c5218728fb844379b1873334d',
+  })
+
+  depends_on 'xorg_lib'
+
+  def self.build
+    system "./configure",
+           "--enable-ipv6",
+           "--enable-tcp-transport",
+           "--enable-unix-transport",
+           "--prefix=#{CREW_PREFIX}",
+           "--enable-local-transport",
+           "--libdir=#{CREW_LIB_PREFIX}"
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end
+