Use /dev/urandom instead of getrandom() am: 7e6b92bc9c am: 36d78ff4a4 am: 13bc4fb605 am: 23714ed845

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/ahash/+/1683025

Change-Id: I9a5014be526e44384a2dec9395c92a63b445c1e6