Add const support in array initialization

[RazrFalcon]

Example:

const LENGTH: usize = 64;

#[repr(C)]
pub struct Data {
    pub d: [u8; LENGTH],
}

If I replace LENGTH with a number - everything works just fine.

[eqrion]

Fixed in 0.1.27. Please reopen if you are still having an issue with this.

[RazrFalcon]

Thanks.