libc++: Install libc++ libraries during setup_board.

To be able to build packages with libc++, libc++ libraries
must be installed during setup_board stage.

BUG=chromium:724628
TEST=./setup_board --board={daisy/peppy} installed libc++ libraries.
CQ-DEPEND=CL:710216

Change-Id: I7bece2ea623f8a40f92c2ab230df08157eb3b19b
Reviewed-on: https://chromium-review.googlesource.com/574646
Commit-Ready: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
1 file changed