Fix context initialization

core/os/os_linux.odin

@@ -245,7 +245,7 @@ exit :: proc(code: int) -> ! {
 	_unix_exit(code);
 }
 
-current_thread_id :: proc() -> int {
+current_thread_id :: proc "contextless" () -> int {
 	// return int(_unix_gettid());
 	return 0;
 }