Try to fix in build script

Author: xd009642

libc-test/build.rs

@@ -2991,6 +2991,9 @@ fn test_emscripten(target: &str) {
             // https://github.com/emscripten-core/emscripten/pull/14883
             "SIG_IGN" => true,
 
+            // Constants present in other linuxes but not emscripten
+            "SI_DETHREAD" | "TRAP_PERF" => true,
+
             // LFS64 types have been removed in Emscripten 3.1.44
             // https://github.com/emscripten-core/emscripten/pull/19812
             n if n.starts_with("RLIM64") => true,