Add new target for supporting Neutrino QNX 6.1 with io-socket network stack on aarch64

Signed-off-by: Florian Bartels <Florian.Bartels@elektrobit.com>

Author: flba-eb

std/Cargo.toml

@@ -139,7 +139,8 @@ test = true
 level = "warn"
 check-cfg = [
     'cfg(bootstrap)',
-    'cfg(target_arch, values("xtensa"))',
+    'cfg(target_arch, values("xtensa", "aarch64-unknown-nto-qnx710_iosock"))',
+    'cfg(target_env, values("nto71_iosock"))',
     # std use #[path] imports to portable-simd `std_float` crate
     # and to the `backtrace` crate which messes-up with Cargo list
     # of declared features, we therefor expect any feature cfg

std/src/sys/pal/unix/process/process_unix.rs

@@ -20,7 +20,7 @@ use crate::{fmt, mem, sys};
 
 cfg_if::cfg_if! {
     // This workaround is only needed for QNX 7.0 and 7.1. The bug should have been fixed in 8.0
-    if #[cfg(any(target_env = "nto70", target_env = "nto71"))] {
+    if #[cfg(any(target_env = "nto70", target_env = "nto71", target_env = "nto71_iosock"))] {
         use crate::thread;
         use libc::{c_char, posix_spawn_file_actions_t, posix_spawnattr_t};
         use crate::time::Duration;
@@ -191,7 +191,8 @@ impl Command {
         target_os = "watchos",
         target_os = "tvos",
         target_env = "nto70",
-        target_env = "nto71"
+        target_env = "nto71",
+        target_env = "nto71_iosock",
     )))]
     unsafe fn do_fork(&mut self) -> Result<pid_t, io::Error> {
         cvt(libc::fork())
@@ -202,7 +203,7 @@ impl Command {
     // Documentation says "... or try calling fork() again". This is what we do here.
     // See also https://www.qnx.com/developers/docs/7.1/#com.qnx.doc.neutrino.lib_ref/topic/f/fork.html
     // This workaround is only needed for QNX 7.0 and 7.1. The bug should have been fixed in 8.0
-    #[cfg(any(target_env = "nto70", target_env = "nto71"))]
+    #[cfg(any(target_env = "nto70", target_env = "nto71", target_env = "nto71_iosock"))]
     unsafe fn do_fork(&mut self) -> Result<pid_t, io::Error> {
         use crate::sys::os::errno;