hypervisor: Suppress unused_unsafe warning

x86::__cpuid is safe on Rust ≥1.94 but unsafe on older versions.  This
causes unused_unsafe warnings when compiling with Rust ≥1.94.  However,
on earlier Rust versions, the code won’t compile if the unsafe blocks
are absent.

Work around this by adding #[allow(unused_unsafe)] where needed to
suppress the warnings.

See #7588 for more discussion.

Signed-off-by: Demi Marie Obenour <demiobenour@gmail.com>

hypervisor/src/hypervisor.rs

@@ -155,7 +155,8 @@ pub trait Hypervisor: Send + Sync {
     /// Determine CPU vendor
     ///
     fn get_cpu_vendor(&self) -> CpuVendor {
-        // SAFETY: call cpuid with valid leaves
+        #[allow(unused_unsafe)]
+        // SAFETY: not actually unsafe, but considered unsafe by current stable
         unsafe {
             let leaf = x86_64::__cpuid(0x0);