Add pulseaudio package

packages/pulseaudio.rb

+require 'package'
+
+class Pulseaudio < Package
+  description 'PulseAudio is a sound system for POSIX OSes, meaning that it is a proxy for your sound applications.'
+  homepage 'https://www.freedesktop.org/wiki/Software/PulseAudio/'
+  version '11.1'
+  source_url 'https://freedesktop.org/software/pulseaudio/releases/pulseaudio-11.1.tar.xz'
+  source_sha256 'f2521c525a77166189e3cb9169f75c2ee2b82fa3fcf9476024fbc2c3a6c9cd9e'
+
+  depends_on 'alsa_plugins'
+  depends_on 'dbus'
+  depends_on 'intltool'
+  depends_on 'libsndfile'
+  depends_on 'libatomic_ops'
+  depends_on 'speexdsp'
+  depends_on 'libcap'
+  depends_on 'libtool'
+  depends_on 'jsonc'
+  depends_on 'gettext'
+
+  def self.build
+    system "./configure \
+            --prefix=#{CREW_PREFIX} \
+            --libdir=#{CREW_LIB_PREFIX} \
+            --disable-x11"
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end