Revert "compiler_wrapper: manually apply -D_FORTIFY_SOURCE=2"

Manual application of `-D_FORTIFY_SOURCE=2` is no longer necessary; the
world is now compatible (enough) with `=3`

BUG=b:288411201
TEST=CQ on crrev.com/c/4794911

This reverts commit 82ce7214523ef45dbc4b5d0503df97ac257123e0.

Change-Id: Iaa23cf211d6cbaa26a6d36944fd14c114c4fc1e2
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/4895335
Commit-Queue: George Burgess <gbiv@chromium.org>
Reviewed-by: Ryan Beltran <ryanbeltran@chromium.org>
Tested-by: George Burgess <gbiv@chromium.org>
30 files changed