Update check-cfg lists for std

Author: tesuji

library/std/Cargo.toml

@@ -82,6 +82,7 @@ system-llvm-libunwind = ["unwind/system-llvm-libunwind"]
 
 # Make panics and failed asserts immediately abort without formatting any message
 panic_immediate_abort = ["core/panic_immediate_abort", "alloc/panic_immediate_abort"]
+restricted-std = []
 
 # Enable std_detect default features for stdarch/crates/std_detect:
 # https://github.com/rust-lang/stdarch/blob/master/crates/std_detect/Cargo.toml
@@ -99,3 +100,13 @@ heap_size = 0x8000000
 name = "stdbenches"
 path = "benches/lib.rs"
 test = true
+
+[lints.rust.unexpected_cfgs]
+level = "warn"
+check-cfg = [
+    'cfg(bootstrap)',
+    'cfg(backtrace_in_libstd)',
+    'cfg(netbsd10)',
+    'cfg(target_arch, values("xtensa"))',
+    'cfg(feature, values("std", "as_crate"))',
+]