update compile-fail tests to current stable error messages

Author: azdle

tests/compile-fail/scope_invariance.rs

@@ -14,8 +14,8 @@ fn main() {
 
                 scope
                     .create_function_mut(|_, ()| {
+                        //~^ error: closure may outlive the current function, but it borrows `test`, which is owned by the current function
                         test.field = 42;
-                        //~^ error: `test` does not live long enough
                         Ok(())
                     })
                     .unwrap()

tests/compile-fail/scope_mutable_aliasing.rs

@@ -12,7 +12,7 @@ fn main() {
         lua.scope(|scope| {
             let a = scope.create_nonstatic_userdata(MyUserData(&mut i)).unwrap();
             let b = scope.create_nonstatic_userdata(MyUserData(&mut i)).unwrap();
-            //~^ error: cannot borrow `*i` as mutable more than once at a time
+            //~^ error: cannot borrow `i` as mutable more than once at a time
         });
     });
 }