Merge pull request #674 from flyingP0tat0/qemu

Add qemu package

packages/qemu.rb

+require 'package'
+
+class Qemu < Package
+  version '2.9.0'
+  source_url 'http://download.qemu-project.org/qemu-2.9.0.tar.xz'
+  source_sha1 '5cc63c6cababaaa7d0685e8b32bacf5022873ebc'
+
+  depends_on 'glib'
+  depends_on 'autoconf'
+  depends_on 'gettext'
+  depends_on 'automake'
+  depends_on 'libtool'
+
+  def self.build
+    system "./configure"
+    system "make"
+  end
+
+  def self.install
+    system "make", "DESTDIR=#{CREW_DEST_DIR}", "install"
+  end
+end