le32-nacl-objdump has been deprecated, and should no longer be used.
Instead, "arm-nacl-objdump" is being used. "le32-nacl-objdump" used to be
a hard link to "arm-nacl-objdump", but has since been deleted in NaCl's
"toolchain_build_pnacl.py" script.

R=phosek@chromium.org, stichnot@chromium.org

Review URL: https://codereview.chromium.org/1776843002 .