fix build

Author: ngxson

common/console.cpp

@@ -36,6 +36,7 @@
 
 namespace console {
 
+#if defined(_WIN32)
     namespace {
         // Use private-use unicode values to represent special keys that are not reported
         // as characters (e.g. arrows on Windows). These values should never clash with
@@ -45,6 +46,7 @@ namespace console {
         static constexpr char32_t KEY_ARROW_UP    = 0xE002;
         static constexpr char32_t KEY_ARROW_DOWN  = 0xE003;
     }
+#endif
 
     //
     // Console state