remove vbox module build

This doesn't actually fix the grsec problem, and will fail if running in
the vanilla kernel during the grsec install process.

roles/virtualbox/files/build_vbox_modules.sh

@@ -1,3 +0,0 @@
-#!/bin/sh
-
-dkms install vboxhost/$(pacman -Q virtualbox|awk '{print $2}'|sed 's/\-.\+//') -k $(uname -rm|sed 's/\ /\//')

roles/virtualbox/tasks/main.yml

@@ -13,16 +13,6 @@
   tags:
     - aur
 
-- name: Push VirtualBox kernel module build script
-  copy: src=build_vbox_modules.sh dest=/root/build_vbox_modules.sh mode=0700
-  tags:
-    - grsec
-
-- name: Build VirtualBox kernel modules
-  command: /root/build_vbox_modules.sh
-  tags:
-    - grsec
-
 - name: Copy kernel modules to load
   copy: src=modules.conf dest=/etc/modules-load.d/virtualbox.conf