Update tests.

Author: m-ou-se

example/mini_core.rs

@@ -681,7 +681,7 @@ impl<T> Index<usize> for [T] {
     }
 }
 
-extern {
+extern "C" {
     type VaListImpl;
 }
 

example/mini_core_hello_world.rs

@@ -258,13 +258,13 @@ fn main() {
 
     assert_eq!(((|()| 42u8) as fn(()) -> u8)(()), 42);
 
-    extern {
+    extern "C" {
         #[linkage = "weak"]
         static ABC: *const u8;
     }
 
     {
-        extern {
+        extern "C" {
             #[linkage = "weak"]
             static ABC: *const u8;
         }

example/mod_bench.rs

@@ -3,7 +3,7 @@
 #![allow(internal_features)]
 
 #[link(name = "c")]
-extern {}
+extern "C" {}
 
 #[panic_handler]
 fn panic_handler(_: &core::panic::PanicInfo<'_>) -> ! {

example/std_example.rs

@@ -7,7 +7,7 @@ use std::arch::x86_64::*;
 use std::io::Write;
 use std::ops::Coroutine;
 
-extern {
+extern "C" {
     pub fn printf(format: *const i8, ...) -> i32;
 }