Add double_conversion package (#4330)

packages/double_conversion.rb

+require 'package'
+
+class Double_conversion < Package
+  description 'Efficient binary-decimal and decimal-binary conversion routines for IEEE doubles.'
+  homepage 'https://github.com/google/double-conversion'
+  version '3.1.5'
+  compatibility 'all'
+  source_url 'https://github.com/google/double-conversion/archive/v3.1.5.tar.gz'
+  source_sha256 'a63ecb93182134ba4293fd5f22d6e08ca417caafa244afaa751cbfddf6415b13'
+
+  binary_url ({
+    aarch64: 'https://dl.bintray.com/chromebrew/chromebrew/double_conversion-3.1.5-chromeos-armv7l.tar.xz',
+     armv7l: 'https://dl.bintray.com/chromebrew/chromebrew/double_conversion-3.1.5-chromeos-armv7l.tar.xz',
+       i686: 'https://dl.bintray.com/chromebrew/chromebrew/double_conversion-3.1.5-chromeos-i686.tar.xz',
+     x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/double_conversion-3.1.5-chromeos-x86_64.tar.xz',
+  })
+  binary_sha256 ({
+    aarch64: '30e4c14b0f6e37c9fbe05f14838e57fc9fccd9f9f79681a062012ca3114e9786',
+     armv7l: '30e4c14b0f6e37c9fbe05f14838e57fc9fccd9f9f79681a062012ca3114e9786',
+       i686: 'd378fa884903a2839320b2d45920cfb929fb4b9f3de7719f7bfb55c406e04730',
+     x86_64: 'db6e20068fb804648d04f21244a9dc9abcc4e36e9aaeb48038e39f51039f845a',
+  })
+
+  def self.build
+    Dir.mkdir 'build'
+    Dir.chdir 'build' do
+      system 'cmake',
+             '-DCMAKE_BUILD_TYPE=Release',
+             "-DCMAKE_INSTALL_PREFIX=#{CREW_PREFIX}",
+             '-DBUILD_SHARED_LIBS=ON',
+             '..'
+      system 'make'
+    end
+  end
+
+  def self.install
+    Dir.chdir 'build' do
+      system 'make', "DESTDIR=#{CREW_DEST_DIR}", 'install'
+    end
+  end
+end