Add a few things necessary for openssl (not all)

src/stdlib/src/lib.rs

@@ -229,7 +229,7 @@ pub extern "C" fn erand(xsubi: [c_ushort; 3]) -> c_double {
 }
 
 #[no_mangle]
-pub unsafe extern "C" fn exit(status: c_int) -> ! {
+pub unsafe extern "C" fn exit(status: c_int) {
     for i in (0..ATEXIT_FUNCS.len()).rev() {
         if let Some(func) = ATEXIT_FUNCS[i] {
             (func)();