dev_install: use a relative libdir symlink

This way the symlink is valid when the dir is mounted elsewhere.

BUG=chromium:462099
TEST=precq passes

Change-Id: I77e69b2758648c48f5b36ec67783a44faa2bee1a
Reviewed-on: https://chromium-review.googlesource.com/272733
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Chris Sosa <sosa@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
1 file changed