Extern blocks must be unsafe

Author: Jake-Shadle

src/win_bindings.rs

@@ -3,10 +3,11 @@
     non_snake_case,
     non_upper_case_globals,
     non_camel_case_types,
-    clippy::upper_case_acronyms
+    clippy::upper_case_acronyms,
+    unsafe_code
 )]
 #[link(name = "ntdll", kind = "raw-dylib")]
-extern "system" {
+unsafe extern "system" {
     #[link_name = "NtClose"]
     pub fn nt_close(handle: Handle) -> Ntstatus;
     #[link_name = "NtOpenProcess"]