USER is the correct variable to use, also this can affect sstate
cache as well.
(Bitbake rev: d7f9edda65dae2e046871afa275c5a51dff48fc4)
Signed-off-by: Matthew McClintock <msm@freescale.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>