src: use UTF-8 for naming interfaces in unix

Use a UTF-8 encoded string for naming interfaces in unix, instead of
using Latin-1, as had been done on windows previously.

PR-URL: #21926
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Tobias Nießen <tniessen@tnie.de>
Reviewed-By: Anatoli Papirovski <apapirovski@mac.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

src/node_os.cc

@@ -257,15 +257,13 @@ static void GetInterfaceAddresses(const FunctionCallbackInfo<Value>& args) {
   for (i = 0; i < count; i++) {
     const char* const raw_name = interfaces[i].name;
 
-    // On Windows, the interface name is the UTF8-encoded friendly name and may
-    // contain non-ASCII characters.  On UNIX, it's just a binary string with
-    // no particular encoding but we treat it as a one-byte Latin-1 string.
-#ifdef _WIN32
+    // Use UTF-8 on both Windows and Unixes (While it may be true that UNIX
+    // systems are somewhat encoding-agnostic here, it’s more than reasonable
+    // to assume UTF8 as the default as well. It’s what people will expect if
+    // they name the interface from any input that uses UTF-8, which should be
+    // the most frequent case by far these days.)
     name = String::NewFromUtf8(env->isolate(), raw_name,
         v8::NewStringType::kNormal).ToLocalChecked();
-#else
-    name = OneByteString(env->isolate(), raw_name);
-#endif
 
     if (ret->Has(env->context(), name).FromJust()) {
       ifarr = Local<Array>::Cast(ret->Get(name));