unsafe some extern C blocks

Author: workingjubilee

crates/cpp_smoke_test/tests/smoke.rs

@@ -3,7 +3,7 @@ extern crate cpp_smoke_test;
 
 use std::sync::atomic::{AtomicBool, Ordering};
 
-extern "C" {
+unsafe extern "C" {
     fn cpp_trampoline(func: extern "C" fn()) -> ();
 }
 

crates/line-tables-only/src/lib.rs

@@ -7,7 +7,7 @@ mod tests {
 
     pub type Callback = extern "C" fn(data: *mut c_void);
 
-    extern "C" {
+    unsafe extern "C" {
         fn foo(cb: Callback, data: *mut c_void);
     }