Fix up allowed cfg list

Co-authored-by: Urgau <3616612+Urgau@users.noreply.github.com>

Author: Mark-Simulacrum

src/bootstrap/lib.rs

@@ -139,9 +139,8 @@ const EXTRA_CHECK_CFGS: &[(Option<Mode>, &str, Option<&[&'static str]>)] = &[
     (Some(Mode::Std), "backtrace_in_libstd", None),
     /* Extra values not defined in the built-in targets yet, but used in std */
     (Some(Mode::Std), "target_env", Some(&["libnx"])),
-    (Some(Mode::Std), "target_os", Some(&["teeos"])),
-    (Some(Mode::Rustc), "target_os", Some(&["hurd"])),
-    (Some(Mode::Std), "target_arch", Some(&["asmjs", "spirv", "nvptx", "xtensa", "csky"])),
+    // (Some(Mode::Std), "target_os", Some(&[])),
+    (Some(Mode::Std), "target_arch", Some(&["asmjs", "spirv", "nvptx", "xtensa"])),
     /* Extra names used by dependencies */
     // FIXME: Used by serde_json, but we should not be triggering on external dependencies.
     (Some(Mode::Rustc), "no_btreemap_remove_entry", None),