Merge "Support building all variants." am: 71b5c52773 am: dcf49805f5 am: 7bc14c1de9 am: b7e4123dab

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/log/+/1356176

Change-Id: Ic54a0661657e6945d91ce36319c0c11ae268783b