Merge "rust: Allow no_stdlibs per-target variants." into main am: 5ade28cb...

Merge "rust: Allow no_stdlibs per-target variants." into main am: 5ade28cb am: 177724f1 am: 686d03a1

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2829091



Change-Id: If26ab6d892e22b5dbad5e0ab79c49d488ea6cd78
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>