Auto merge of rust-lang#106673 - flba-eb:add_qnx_nto_stdlib, r=workingjubilee

Add support for QNX Neutrino to standard library

This change:

- adds standard library support for QNX Neutrino (7.1).
- upgrades `libc` to version `0.2.139` which supports QNX Neutrino

`@gh-tr`

⚠️ Backtraces on QNX require rust-lang/backtrace-rs#507 which is not yet merged! (But everything else works without these changes) ⚠️

Tested mainly with a x86_64 virtual machine (see qnx-nto.md) and partially with an aarch64 hardware (some tests fail due to constrained resources).

Author: bors

Cargo.lock

@@ -2319,9 +2319,9 @@ checksum = "830d08ce1d1d941e6b30645f1a0eb5643013d835ce3779a5fc208261dbe10f55"
 
 [[package]]
 name = "libc"
-version = "0.2.138"
+version = "0.2.139"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "db6d7e329c562c5dfab7a46a2afabc8b987ab9a4834c9d1ca04dc54c1546cef8"
+checksum = "201de327520df007757c1f0adce6e827fe8562fbc28bfd9c15571c66ca1f5f79"
 dependencies = [
  "rustc-std-workspace-core",
 ]

library/core/src/ffi/mod.rs

@@ -144,6 +144,7 @@ mod c_char_definition {
                 )
             ),
             all(target_os = "fuchsia", target_arch = "aarch64"),
+            all(target_os = "nto", target_arch = "aarch64"),
             target_os = "horizon"
         ))] {
             pub type c_char = u8;