add Elf_Dyn support

This adds support for Elf_Dyn tags.  Pull request sent to upstream:
	https://bitbucket.org/eliben/pyelftools/pull-request/5/add-support-for-parsing-of-the-dynamic/diff

BUG=chromium-os:36453
TEST=lddtree.py works

Change-Id: Iaf383eacc45adccb4dfc33e275028a8e7f58ff1e
Reviewed-on: https://gerrit.chromium.org/gerrit/38667
Reviewed-by: David James <davidjames@chromium.org>
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
4 files changed