Add glog package. (#2198)

* Add glog package.

* Update glog package.

packages/glog.rb

+require 'package'
+
+class Glog < Package
+  description 'A C++ implementation of the Google logging module.'
+  homepage 'https://github.com/google/glog'
+  version '0.3.5'
+
+  source_url 'https://github.com/google/glog/archive/v0.3.5.zip'
+  source_sha256 '267103f8a1e9578978aa1dc256001e6529ef593e5aea38193d31c2872ee025e8'
+
+  depends_on 'unzip' => :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