Auto merge of #108792 - Amanieu:ohos, r=petrochenkov

Add OpenHarmony targets

- `aarch64-unknown-linux-ohos`
- `armv7-unknown-linux-ohos`

Compiler team MCP: https://github.com/rust-lang/compiler-team/issues/568

library/std/src/sys/unix/os.rs

@@ -115,7 +115,10 @@ pub fn set_errno(e: i32) {
 /// Gets a detailed string description for the given error number.
 pub fn error_string(errno: i32) -> String {
     extern "C" {
-        #[cfg_attr(any(target_os = "linux", target_env = "newlib"), link_name = "__xpg_strerror_r")]
+        #[cfg_attr(
+            all(any(target_os = "linux", target_env = "newlib"), not(target_env = "ohos")),
+            link_name = "__xpg_strerror_r"
+        )]
         fn strerror_r(errnum: c_int, buf: *mut c_char, buflen: libc::size_t) -> c_int;
     }