compiler_wrapper: Stop managing pie flags

With CL:3710850, pie will be defaults for clang and GCC
(cross-compiles). No need to manage them separately.

BUG=b:190047257
TEST=go test

Change-Id: Icf8e74d6a31c5de678ec9a6a5c321a17a0154d37
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/3722436
Reviewed-by: Jordan Abrahams-Whitehead <ajordanr@google.com>
Reviewed-by: George Burgess <gbiv@chromium.org>
Auto-Submit: Manoj Gupta <manojgupta@chromium.org>
Tested-by: Manoj Gupta <manojgupta@chromium.org>
Commit-Queue: George Burgess <gbiv@chromium.org>
34 files changed