PNaCl nativeld driver: Don't pass unnecessary "-m" option to ld
PNaCl nativeld driver: Don't pass unnecessary "-m" option to ld

It looks like this option is only meaningful for BFD ld, which the PNaCl
toolchain doesn't use.  The man page for 'gold' says:

       -m EMULATION
              Set GNU linker emulation; obsolete

BUG=none
TEST=PNaCl toolchain trybots
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/330703002

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@13337 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client