Skip certain tests on sparc64 due to old glibc version.

Author: kosayoda

libc-test/build.rs

@@ -3693,6 +3693,10 @@ fn test_linux(target: &str) {
             // FIXME: the glibc version used by the Sparc64 build jobs
             // which use Debian 10.0 is too old.
             "statx" if sparc64 => true,
+            // Needs glibc 2.34 or later.
+            "posix_spawn_file_actions_addclosefrom_np" if gnu && sparc64 => true,
+            // Needs glibc 2.35 or later.
+            "posix_spawn_file_actions_addtcsetpgrp_np" if gnu && sparc64 => true,
 
             // FIXME: Deprecated since glibc 2.30. Remove fn once upstream does.
             "sysctl" if gnu => true,