Add rtaudio package (#3882)

Add pre-built binaries

packages/rtaudio.rb

+require 'package'
+
+class Rtaudio < Package
+  description 'RtAudio is a set of C++ classes that provide a common API (Application Programming Interface) for realtime audio input/output'
+  homepage 'http://www.music.mcgill.ca/~gary/rtaudio/'
+  version '5.1.0'
+  source_url 'http://www.music.mcgill.ca/~gary/rtaudio/release/rtaudio-5.1.0.tar.gz'
+  source_sha256 'ff138b2b6ed2b700b04b406be718df213052d4c952190280cf4e2fab4b61fe09'
+
+  binary_url ({
+    aarch64: 'https://dl.bintray.com/chromebrew/chromebrew/rtaudio-5.1.0-chromeos-armv7l.tar.xz',
+     armv7l: 'https://dl.bintray.com/chromebrew/chromebrew/rtaudio-5.1.0-chromeos-armv7l.tar.xz',
+       i686: 'https://dl.bintray.com/chromebrew/chromebrew/rtaudio-5.1.0-chromeos-i686.tar.xz',
+     x86_64: 'https://dl.bintray.com/chromebrew/chromebrew/rtaudio-5.1.0-chromeos-x86_64.tar.xz',
+  })
+  binary_sha256 ({
+    aarch64: '41cb81dbff61759c229705a92299c6e53329c8958d4d6381ea9d450750896e5d',
+     armv7l: '41cb81dbff61759c229705a92299c6e53329c8958d4d6381ea9d450750896e5d',
+       i686: '2ac3063104abbe1c0bfe2e38a437dfddb506b2e2ef40f3707606a5a899492c06',
+     x86_64: '78bd93817203d87bfe03d8d203b8f0ac792339b5214b08bc1ccbcc842499793b',
+  })
+
+  depends_on 'alsa_lib'
+  depends_on 'jack'
+  depends_on 'pulseaudio'
+
+  def self.build
+    system './configure',
+           "--prefix=#{CREW_PREFIX}",
+           "--libdir=#{CREW_LIB_PREFIX}",
+           '--disable-maintainer-mode',
+           '--with-alsa',
+           '--with-jack',
+           '--with-pulse'
+    system 'make'
+  end
+
+  #def self.check
+  #  system 'make', 'check'
+  #end
+
+  def self.install
+    system 'make', "DESTDIR=#{CREW_DEST_DIR}", 'install'
+  end
+end