vagrant: improve darwin64 VM settings

somehow without these cpuid settings it does not work for everybody.
also nice if we can get away without the extensions pack, which is proprietary.
do not update iTunes, we just want the OS security / bugfix updates

Vagrantfile

@@ -63,6 +63,8 @@ end
 def packages_darwin
   return <<-EOF
     # install all the (security and other) updates
+    sudo softwareupdate --ignore iTunesX
+    sudo softwareupdate --ignore iTunes
     sudo softwareupdate --install --all
     # get osxfuse 3.x release code from github:
     curl -s -L https://github.com/osxfuse/osxfuse/releases/download/osxfuse-3.5.4/osxfuse-3.5.4.dmg >osxfuse.dmg
@@ -458,6 +460,16 @@ Vagrant.configure(2) do |config|
   # OS X
   config.vm.define "darwin64" do |b|
     b.vm.box = "jhcook/yosemite-clitools"
+    b.vm.provider :virtualbox do |v|
+      v.customize ['modifyvm', :id, '--ostype', 'MacOS1010_64']
+      v.customize ['modifyvm', :id, '--paravirtprovider', 'default']
+      # Adjust CPU settings according to
+      # https://github.com/geerlingguy/macos-virtualbox-vm
+      v.customize ['modifyvm', :id, '--cpuidset',
+                   '00000001', '000306a9', '00020800', '80000201', '178bfbff']
+      # Disable USB variant requiring Virtualbox proprietary extension pack
+      v.customize ["modifyvm", :id, '--usbehci', 'off', '--usbxhci', 'off']
+    end
     b.vm.provision "packages darwin", :type => :shell, :privileged => false, :inline => packages_darwin
     b.vm.provision "install pyenv", :type => :shell, :privileged => false, :inline => install_pyenv("darwin64")
     b.vm.provision "fix pyenv", :type => :shell, :privileged => false, :inline => fix_pyenv_darwin("darwin64")