lddtree: sync with upstream
lddtree: sync with upstream

This pulls in misc fixes, but the ones we care about:
 - $ORIGIN with --root
 - new --skip-non-elfs for use by test_image_content

BUG=None
TEST=`./build_image` for x86-alex passes

Change-Id: Iabe8a8ba68da18fa6f1182ad0a32fb3ec3b00997
Reviewed-on: https://gerrit.chromium.org/gerrit/48849
Reviewed-by: Ryan Cui <5ce1592d53754a87a44fc2eb7b63d5f77cf50fdb@chromium.org>
Commit-Queue: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>
Tested-by: Mike Frysinger <8f3f75c74bd5184edcfa6534cab3c13a00a2f794@chromium.org>

bpsinc-native/src_third_party_chromite,chadversary/chromiumos.chromite,chadversary/chromiumos.chromite,bpsinc-native/src_third_party_chromite,bpsinc-native/src_third_party_chromite