Create libxrender.rb (#1805)

* Create libxrender.rb

Graphviz needs this library to compile.

* Update libxrender.rb

packages/libxrender.rb

+require 'package'
+
+class Libxrender < Package
+  description 'X Rendering Extension client library.'
+  homepage 'http://www.x.org'
+  version '0.9.10'
+  source_url 'https://www.x.org/releases/individual/lib/libXrender-0.9.10.tar.gz'
+  source_sha256 '770527cce42500790433df84ec3521e8bf095dfe5079454a92236494ab296adf'
+
+  depends_on 'pkgconfig' => :build
+
+  def self.build
+    system "./configure --prefix=#{CREW_PREFIX} --libdir=#{CREW_LIB_PREFIX}"
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end