Merge pull request #3708 from cuviper/ci-sparc64-0.2

[0.2] Revert "Upgrade Docker images to Ubuntu 23.10" on sparc64

Author: the8472

ci/docker/sparc64-unknown-linux-gnu/Dockerfile

@@ -1,4 +1,4 @@
-FROM ubuntu:23.10
+FROM ubuntu:22.04
 
 RUN apt-get update && apt-get install -y --no-install-recommends \
         curl ca-certificates \

libc-test/build.rs

@@ -3909,6 +3909,12 @@ fn test_linux(target: &str) {
             | "SW_CNT"
                 if ppc64 || riscv64 => true,
 
+            // FIXME: requires more recent kernel headers on CI
+            | "MFD_EXEC"
+            | "MFD_NOEXEC_SEAL"
+            | "SECCOMP_FILTER_FLAG_WAIT_KILLABLE_RECV"
+                if sparc64 => true,
+
             // FIXME: Not currently available in headers on ARM and musl.
             "NETLINK_GET_STRICT_CHK" if arm || musl => true,