finish fixing broken un-unsupervise windows tests

src/test/run-pass/binops.rs

@@ -116,8 +116,8 @@ fn h(_i: int) { }
 #[abi = "cdecl"]
 #[nolink]
 extern mod test {
-    fn rust_get_sched_id();
-    fn get_task_id();
+    fn rust_get_sched_id() -> libc::intptr_t;
+    fn get_task_id() -> libc::intptr_t;
 }
 
 fn test_foreign_fn() {

src/test/run-pass/c-stack-as-value.rs

@@ -1,6 +1,6 @@
 #[abi = "cdecl"]
 extern mod rustrt {
-    fn get_task_id();
+    fn get_task_id() -> libc::intptr_t;
 }
 
 fn main() {

src/test/run-pass/issue-506.rs

@@ -9,7 +9,10 @@
 
 #[abi = "cdecl"]
 extern mod rustrt {
-    fn get_task_id();
+    fn get_task_id() -> libc::intptr_t;
 }
 
-fn main() { task::spawn(rustrt::get_task_id); }
+fn main() {
+    let f: fn() -> libc::intptr_t = rustrt::get_task_id;
+    task::spawn(unsafe { unsafe::reinterpret_cast(f) });
+}

src/test/run-pass/morestack6.rs

@@ -11,7 +11,7 @@
     fn rust_get_sched_id() -> libc::intptr_t;
     fn last_os_error() -> ~str;
     fn rust_getcwd() -> ~str;
-    fn get_task_id();
+    fn get_task_id() -> libc::intptr_t;
     fn sched_threads();
     fn rust_get_task();
 }