Unignore aarch64-linux-android

Author: JohnTitor

.github/workflows/bors.yml

@@ -125,9 +125,7 @@ jobs:
       max-parallel: 12
       matrix:
         target: [
-          # FIXME: Mysterious failures in CI, see
-          # https://github.com/rust-lang/libc/issues/2081
-          # aarch64-linux-android,
+          aarch64-linux-android,
           aarch64-unknown-linux-gnu,
           aarch64-unknown-linux-musl,
           arm-linux-androideabi,

libc-test/build.rs

@@ -1544,6 +1544,7 @@ fn test_android(target: &str) {
         t => panic!("unsupported target: {}", t),
     };
     let x86 = target.contains("i686") || target.contains("x86_64");
+    let aarch64 = target.contains("aarch64");
 
     let mut cfg = ctest_cfg();
     cfg.define("_GNU_SOURCE", None);
@@ -1879,6 +1880,10 @@ fn test_android(target: &str) {
             | "SW_MAX"
             | "SW_CNT" => true,
 
+            // FIXME: aarch64 env cannot find it:
+            | "PTRACE_GETREGS"
+            | "PTRACE_SETREGS" if aarch64 => true,
+
             _ => false,
         }
     });