xcbgen-rs: Remove another outdated FIXME.
@@ -1129,7 +1129,6 @@ impl Alignment {
/// non-negative value of `n`.
///
/// `incr` must be zero or a power of 2
-// FIXME: Make the members non-pub and make the constructor enforce the power-of-2 requirement.
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub struct VariableSize {
base: u32,
