Auto merge of rust-lang#90392 - solid-rs:fix-solid-support, r=Mark-Simulacrum

kmc-solid: Fix SOLID target

This PR is a follow-up for rust-lang#86191 and necessary to make the [`*-kmc-solid_*`](https://doc.rust-lang.org/nightly/rustc/platform-support/kmc-solid.html) Tier 3 targets actually usable.

 - Bumps `libc` to 0.2.106, which includes <rust-lang/libc#2227>.
 - Applies the change made by rust-lang#89324 to this target's target-specific code.

Author: bors

std/Cargo.toml

@@ -15,7 +15,7 @@ cfg-if = { version = "0.1.8", features = ['rustc-dep-of-std'] }
 panic_unwind = { path = "../panic_unwind", optional = true }
 panic_abort = { path = "../panic_abort" }
 core = { path = "../core" }
-libc = { version = "0.2.103", default-features = false, features = ['rustc-dep-of-std'] }
+libc = { version = "0.2.106", default-features = false, features = ['rustc-dep-of-std'] }
 compiler_builtins = { version = "0.1.44" }
 profiler_builtins = { path = "../profiler_builtins", optional = true }
 unwind = { path = "../unwind" }

std/src/sys/itron/thread.rs

@@ -347,6 +347,6 @@ unsafe fn terminate_and_delete_current_task() -> ! {
     unsafe { crate::hint::unreachable_unchecked() };
 }
 
-pub fn available_concurrency() -> io::Result<crate::num::NonZeroUsize> {
+pub fn available_parallelism() -> io::Result<crate::num::NonZeroUsize> {
     super::unsupported()
 }