Disable aarch64-linux-android in CI

Author: workingjubilee

.github/workflows/bors.yml

@@ -103,7 +103,9 @@ jobs:
       max-parallel: 12
       matrix:
         target: [
-          aarch64-linux-android,
+          # FIXME: Mysterious failures in CI, see
+          # https://github.com/rust-lang/libc/issues/2081
+          # aarch64-linux-android,
           aarch64-unknown-linux-gnu,
           aarch64-unknown-linux-musl,
           arm-linux-androideabi,