compiler_wrapper: Use ld.bfd to detect binutils path

Use ld.bfd instead of ld to detect binutils path. This is to assist
in finding packages that use GCC/Binutils ignoring portage
enviroment.

BUG=b:193847062
TEST=go test

Change-Id: I0fd8c5c13ad2227f03ec3193c58c9bdfca4e4dc6
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/3365636
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Auto-Submit: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: George Burgess <gbiv@chromium.org>
Commit-Queue: George Burgess <gbiv@chromium.org>
2 files changed