The _localversion-rt is used to make localversion-rt from next
gbs incremental build. So removing it causes different result for
next gbs incremental build. Do not remove the _localversion-rt.
Change-Id: Ia9e3edad218dc3ff42698a8aba9a33510de53e3b Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>