Generate apex_available from c2a instead of a patch am: 8ac1c616dc am: c20f8c696b am: 63045bde98 am: 7cc797d01e

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/mio/+/1688984

Change-Id: I90bccb339338d51bf693ca88494fff84b9037bf6