UPDATE-SuperSU-v1.99.zip

Change-Id: I6745392f3eb5998a0987d4b17a1b9d3ca1833e9c
default to busybox tar:
- use busybox tar by default as it now supports selinux context backup/restore
- unify libtar and busybox tar options (-p for selinux context)

Change-Id: I2222f6814fb08d1216dcf346f88dc6143e87fb11