setup_board: add ELF qa post_install hooks for all boards.

BUG=chromium-os:24742
TEST=./setup_board --board=$board
  emerge-$board quipper # no warnings.
  sudo binutils-config <non-gold config>
  emerge-$board quipper # gold warning.
  <edit> # Change sysroot wrapper to not pass in -fstack-protector
  emerge-$board quipper # stack warning.
  etc.

Change-Id: I94ccda99e9ac47c25ff23a7fe45774fb62447e4c
Reviewed-on: https://gerrit.chromium.org/gerrit/34151
Tested-by: asharif <asharif@chromium.org>
Reviewed-by: <jimhebert@google.com>
Reviewed-by: David James <davidjames@chromium.org>
Commit-Ready: asharif <asharif@chromium.org>
2 files changed