test: Un-ignore smallest-hello-world.rs

Rebased through the ages to bring the test up to date.

Closes #8538

src/test/run-pass/smallest-hello-world.rs

@@ -8,30 +8,21 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-// ignore-test - FIXME(#8538) some kind of problem linking induced by extern "C" fns
-
 // Smallest hello world with no runtime
 
 #![no_std]
 
-// This is an unfortunate thing to have to do on linux :(
-#[cfg(target_os = "linux")]
-#[doc(hidden)]
-pub mod linkhack {
-    #[link_args="-lrustrt -lrt"]
-    extern {}
-}
+extern crate libc;
 
-extern {
-    fn puts(s: *u8);
-}
+extern { fn puts(s: *u8); }
+extern "rust-intrinsic" { fn transmute<T, U>(t: T) -> U; }
 
-extern "rust-intrinsic" {
-    fn transmute<T, U>(t: T) -> U;
-}
+#[no_mangle]
+pub extern fn rust_stack_exhausted() {}
 
 #[start]
-pub fn main(_: int, _: **u8, _: *u8) -> int {
+#[no_split_stack]
+fn main(_: int, _: **u8) -> int {
     unsafe {
         let (ptr, _): (*u8, uint) = transmute("Hello!");
         puts(ptr);