fixup! More that need the low 6.x

Author: tgross35

libc-test/build.rs

@@ -4279,8 +4279,21 @@ fn test_linux(target: &str) {
  // is a private value for kernel usage normally
  "FUSE_SUPER_MAGIC" => true,
 
- // present in recent kernels only >= 5.19
- "PR_SME_SET_VL" | "PR_SME_GET_VL" | "PR_SME_VL_LEN_MAX" | "PR_SME_SET_VL_INHERIT" | "PR_SME_SET_VL_ONE_EXEC" => true,
+ // Not present on old musl
+ "PR_SET_VMA"
+ | "PR_SET_VMA_ANON_NAME"
+ | "PR_SCHED_CORE"
+ | "PR_SCHED_CORE_CREATE"
+ | "PR_SCHED_CORE_GET"
+ | "PR_SCHED_CORE_MAX"
+ | "PR_SCHED_CORE_SCOPE_PROCESS_GROUP"
+ | "PR_SCHED_CORE_SCOPE_THREAD"
+ | "PR_SCHED_CORE_SCOPE_THREAD_GROUP"
+ | "PR_SCHED_CORE_SHARE_FROM"
+ | "PR_SCHED_CORE_SHARE_TO" if old_musl => true,
+
+ // Not present in glibc
+ "PR_SME_VL_LEN_MAX" | "PR_SME_SET_VL_INHERIT" | "PR_SME_SET_VL_ONE_EXEC" if gnu => true,
 
  // FIXME(linux): The below is no longer const in glibc 2.34:
  // https://github.com/bminor/glibc/commit/5d98a7dae955bafa6740c26eaba9c86060ae0344