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

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

Change-Id: I3e995b02f5ed3489d7ab1181be29bcf85446b54e