talk-llama : add language auto detect (#1467)

* Add '-l auto' to talk-llama example

* Update examples/talk-llama/talk-llama.cpp

---------

Co-authored-by: Georgi Gerganov <[email protected]>

examples/talk-llama/talk-llama.cpp

@@ -248,7 +248,7 @@ int main(int argc, char ** argv) {
         return 1;
     }
 
-    if (whisper_lang_id(params.language.c_str()) == -1) {
+    if (params.language != "auto" && whisper_lang_id(params.language.c_str()) == -1) {
         fprintf(stderr, "error: unknown language '%s'\n", params.language.c_str());
         whisper_print_usage(argc, argv, params);
         exit(0);