x86: Add in the VirtualBox emulator as a separate build target

Change-Id: Icff81a757952b7652d171bc95773e177c4fd7772
Signed-off-by: Bruce Beare <brucex.j.beare@intel.com>
diff --git a/envsetup.sh b/envsetup.sh
index 8289c82..7ca0e3a 100644
--- a/envsetup.sh
+++ b/envsetup.sh
@@ -431,6 +431,7 @@
 # add the default one here
 add_lunch_combo full-eng
 add_lunch_combo full_x86-eng
+add_lunch_combo vbox_x86-eng
 
 # if we're on linux, add the simulator.  There is a special case
 # in lunch to deal with the simulator