Add support for alternative network stack io-sock on QNX 7.1 aarch64 and x86_64

Author: flba-eb

src/target/llvm.rs

@@ -42,7 +42,8 @@ pub(crate) fn guess_llvm_target_triple(
         os => os,
     };
     let env = match env {
-        "newlib" | "nto70" | "nto71" | "ohos" | "p1" | "p2" | "relibc" | "sgx" | "uclibc" => "",
+        "newlib" | "nto70" | "nto71" | "nto71_iosock" | "ohos" | "p1" | "p2" | "relibc" | "sgx"
+        | "uclibc" => "",
         env => env,
     };
     let abi = match abi {