elfutils: 0.170 -> 0.172

elfutils: 0.170 -> 0.172

- Update debian 0.170 patches and rebase them for 0.172;

- Drop 0001-Use-fallthrough-attribute.patch which was
  accepted by upstream;

- Drop 0001-Ensure-that-packed-structs-follow-the-gcc-memory-lay.patch
  which was backported from upstream;

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>