Merge "Reapply patch to link 'signal' into libstd" am: 8a7834696e

Original change: https://android-review.googlesource.com/c/platform/prebuilts/rust/+/1580850

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I2242380e9fa28d48b0b387400f75573cf5032df9