Switch to the hermetic toybox gzip. am: 615a1fced5 am: 8f47b62337 am: d3b6ee4295 am: c41e77fba4 am: b1e99b5a74

Original change: https://android-review.googlesource.com/c/platform/system/tools/mkbootimg/+/2631951

Change-Id: Iabc8816b2d2409b7fa92ff2a90c666be07b46814
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>