Android compatibility

[Fritiofhedstrom]

I'd like to use Bastion for my android project, but stumbled upon a problem.
When compiling with --target aarch64-linux-android then this code in src/placement.rs generates the stub only.

#[cfg(target_os = "linux")]
#[inline]
fn get_core_ids_helper() -> Option<Vec<CoreId>> {
    linux::get_core_ids()
}

What i would like is this:
#[cfg(any(target_os = "linux", target_os="android"))]
Not sure how many other places that are affected by this. There is a way to manually set the --cfg target_os in rustc, but it feels more cumbersome and not the correct way.

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[DAOCUONG]

i. have same problem with ios

[o0Ignition0o]

Hmm I'd be happy to take a PR that adds ios support as well, i suppose the linux functions shall work, but it would need to be tested

[DAOCUONG]

Lets me test with ios and confirm

[DAOCUONG]

crash thread 'bastion-driver-dynamic' panicked at 'called Option::unwrap() on a None value', /Users/dao/.cargo/registry/src/github.com-1ecc6299db9ec823/bastion-executor-0.4.2/src/load_balancer.rs:36:58
note: run with RUST_BACKTRACE=1 environment variable to display a backtrace
thread 'bastion-driver-dynamic' panicked at 'Lazy instance has previously been poisoned', /Users/dao/.cargo/registry/src/github.com-1ecc6299db9ec823/once_cell-1.15.0/src/lib.rs:1261:25
thread 'bastion-driver-dynamic' panicked at 'Lazy instance has previously been poisoned', /Users/dao/.cargo/registry/src/github.com-1ecc6299db9ec823/once_cell-1.15.0/src/lib.rs:1261:25
thread 'bastion-driver-static' panicked at 'Lazy instance has previously been poisoned', /Users/dao/.cargo/registry/src/github.com-1ecc6299db9ec823/once_cell-1.15.0/src/lib.rs:1261:25
thread 'bastion-driver-dynamic' panicked at 'Lazy instance has previously been poisoned', /Users/dao/.cargo/registry/src/github.com-1ecc6299db9ec823/once_cell-1.15.0/src/lib.rs:1261:25
thread 'bastion-driver-dynamic' panicked at 'Lazy instance has previously been poisoned', /Users/dao/.cargo/registry/src/github.com-1ecc6299db9ec823/once_cell-1.15.0/src/lib.rs:1261:25
thread 'bastion-driver-static' panicked at 'Lazy instance has previously been poisoned', /Users/dao/DAO MANH CUONG
.cargo/registry/src/github.com-1ecc6299db9ec823/once_cell-1.15.0/src/lib.rs:1261:25
thread 'bastion-driver-dynamic' panicked at 'Lazy instance has previously been poisoned', /Users/dao/.cargo/registry/src/github.com-1ecc6299db9ec823/once_cell-1.15.0/src/lib.rs:1261:25
thread 'bastion-blocking-driver-standalone' panicked at 'Lazy instance has previously been poisoned', /Users/dao/.cargo/registry/src/github.com-1ecc6299db9ec823/once_cell-1.15.0/src/lib.rs:1261:25
thread 'bastion-blocking-driver-standalone' panicked at 'Lazy instance has previously been poisoned', /Users/dao/.cargo/registry/src/github.com-1ecc6299db9ec823/once_cell-1.15.0/src/lib.rs:1261:25