Fix test case. Needs no_mangle and aux-build

Author: mneumann

src/test/auxiliary/thread-local-extern-static.rs

@@ -9,6 +9,8 @@
 // except according to those terms.
 
 #![feature(thread_local)]
+#![crate_type = "lib"]
 
+#[no_mangle]
 #[thread_local]
 pub static FOO: u32 = 3;

src/test/run-pass/thread-local-extern-static.rs

@@ -8,6 +8,8 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
+// aux-build:thread-local-extern-static.rs
+
 #![feature(thread_local)]
 
 extern crate thread_local_extern_static;