Update common.cpp

add #include <thread> as it was in earlier versions of common.cpp. 
Without  this under Windows (gcc  mingw) didn't work ctl+c in cmd.

Author: magicse

common/common.cpp

@@ -57,6 +57,7 @@
 #if defined(LLAMA_USE_CURL)
 #include <curl/curl.h>
 #include <curl/easy.h>
+#include <thread>
 #include <future>
 #endif