Compilation failure on MacOS arm64

[schell]

I'm seeing errors in the corebluetooth code that looks like objective-c bindings stuff. I'm on macos arm64. This is a different compilation error than #39. I see this on every rustup channel I've tried so far including 1.59 (nightly), 1.57 (stable) and 1.56.

error[E0606]: casting `bool` as `*mut Object` is invalid
  --> /Users/schell/arm64_narrative/cargo/git/checkouts/bluster-a7618b078c3d8ba7/aa886ad/src/peripheral/corebluetooth/events.rs:40:67
   |
40 |                 delegate.set_ivar::<*mut Object>(POWERED_ON_IVAR, NO as *mut Object);
   |                                                                   ^^^^^^^^^^^^^^^^^

error[E0606]: casting `bool` as `*mut Object` is invalid
  --> /Users/schell/arm64_narrative/cargo/git/checkouts/bluster-a7618b078c3d8ba7/aa886ad/src/peripheral/corebluetooth/events.rs:44:67
   |
44 |                 delegate.set_ivar::<*mut Object>(POWERED_ON_IVAR, YES as *mut Object);
   |                                                                   ^^^^^^^^^^^^^^^^^^

error[E0054]: cannot cast as `bool`
  --> /Users/schell/arm64_narrative/cargo/git/checkouts/bluster-a7618b078c3d8ba7/aa886ad/src/peripheral/corebluetooth/into_bool.rs:19:9
   |
19 |         (self as BOOL).into_bool()
   |         ^^^^^^^^^^^^^^ unsupported cast

error[E0606]: casting `bool` as `*mut Object` is invalid
   --> /Users/schell/arm64_narrative/cargo/git/checkouts/bluster-a7618b078c3d8ba7/aa886ad/src/peripheral/corebluetooth/peripheral_manager.rs:230:59
    |
230 |         delegate.set_ivar::<*mut Object>(POWERED_ON_IVAR, NO as *mut Object);
    |                     
    ```

[schell]

Removing the turbofish type applications and casts cuts down the errors to a single case:

error[E0054]: cannot cast as `bool`
  --> src/peripheral/corebluetooth/into_bool.rs:19:9
   |
19 |         (self as BOOL).into_bool()
   |         ^^^^^^^^^^^^^^ unsupported cast

[schell]

I realized the previous strategy was a red herring after seeing the objc library's definition of BOOL and finding this comment on SO.

[schell]

The issue linked above (SSheldon/rust-objc#110) seems to indicate that the problem is the way these ivars are being used. I'm providing a "fix". It seems to pass tests on my M1 but I don't understand the domain very well so please take it with a grain of salt.