Make ConstNullValue a static.

[Ms2ger]

consts don't have addresses.

[jdm]

src/rust.rs:303:40: 303:58 error: the trait `core::marker::Sync` is not implemented for the type `*mut jsapi_linux_64::JSObject` [E0277]

src/rust.rs:303 static ConstNullValue: *mut JSObject = 0 as *mut JSObject;

                                                       ^~~~~~~~~~~~~~~~~~

src/rust.rs:303:40: 303:58 help: run `rustc --explain E0277` to see a detailed explanation

src/rust.rs:303:40: 303:58 note: `*mut jsapi_linux_64::JSObject` cannot be shared between threads safely

src/rust.rs:303:40: 303:58 note: shared static variables must have a type that implements `Sync`

[nox]

ptr::null_mut() is a const function.

[jdm]

Closing due to lack of activity.