hiffy use of mutable statics is possibly unsound

With the latest toolchain update we're getting these warnings from hiffy.

warning: creating a shared reference to mutable static is discouraged
   --> task/hiffy/src/main.rs:173:29
    |
173 |         let data = unsafe { &HIFFY_DATA };
    |                             ^^^^^^^^^^^ shared reference to mutable static
    |
    = note: for more information, see issue #114447 <https://github.com/rust-lang/rust/issues/114447>
    = note: this will be a hard error in the 2024 edition
    = note: this shared reference has lifetime `'static`, but if the static ever gets mutated, or a mutable reference is created, then any further use of this shared reference is Undefined Behavior
help: use `addr_of!` instead to create a raw pointer
    |
173 |         let data = unsafe { addr_of!(HIFFY_DATA) };
    |                             ~~~~~~~~~~~~~~~~~~~~

I can't convince myself by local inspection that what the task is doing with statics is sound. Someone more familiar with the code will need to go in there and fix it.

Read task/hiffy/src/main.rs around line 173 and trace the declaration and uses of HIFFY_DATA. Run the hiffy build with the latest toolchain; done means the mutable-static warning is resolved and the access is established as sound.