[Bug] Cross-compilation fails for arm64

[connoranderson]

Describe the bug

Trying to cross-compile following instructions in the readme. Seeing error

error[E0080]: evaluation of constant value failed
  --> src/platform/synchronization.rs:15:1
   |
15 | / decl_c_type!(
16 | |     owned(z_owned_mutex_t, option(Mutex<()>, Option<MutexGuard<'static, ()>>)),
17 | |     loaned(z_loaned_mutex_t),
18 | | );
   | |_^ the evaluated program panicked at 'Size mismatch: type z_loaned_mutex_t has size 24 while type (Mutex<()>, Option<MutexGuard<'static, ()>>) has size 16', src/platform/synchronization.rs:15:1
   |
   = note: this error originates in the macro `$crate::panic::panic_2021` which comes from the expansion of the macro `decl_c_type` (in Nightly builds, run with -Z macro-backtrace for more info)

For more information about this error, try `rustc --explain E0080`.

To reproduce

export RUSTFLAGS="-Clinker=aarch64-linux-gnu-gcc -Car=aarch64-linux-gnu-ar"
mkdir build && cd build
cmake .. \
  -DCMAKE_SYSTEM_NAME="Linux" \
  -DCMAKE_C_COMPILER="aarch64-linux-gnu-gcc" \
  -DCMAKE_CXX_COMPILER="aarch64-linux-gnu-g++" \
  -DCMAKE_SYSTEM_PROCESSOR="aarch64" \
  -DZENOHC_CARGO_CHANNEL="+nightly" \
  -DZENOHC_CARGO_FLAGS="-Zbuild-std=std,panic_abort" \
  -DZENOHC_CUSTOM_TARGET="aarch64-unknown-linux-gnu" \
  -DCMAKE_TOOLCHAIN_FILE="../../arm64-toolchain.cmake" \
  -DCMAKE_INSTALL_PREFIX="~/arm64-zenoh-build-artifacts"
  
cmake --build . --config Release

System info

• Ubuntu 22.04
• Host arch = x86_64
• Zenoh 1.1.0

[connoranderson]

Closing. Worked when switching from nightly to stable.