compiler_wrapper: add go.mod

In order to build this outside of the chroot, we apparently now need a
go.mod file. This is autogenerated by the `go` tool.

BUG=None
TEST=Built inside and outside of the chroot

Change-Id: I185cb9b626c8b3655ce5cc72524ef2511c7f575e
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/toolchain-utils/+/2676607
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Tested-by: George Burgess <gbiv@chromium.org>
2 files changed