AllCommands: "commands" returns playlist commands only if playlist_directory configured

src/command/PlaylistCommands.hxx

@@ -21,9 +21,14 @@
 #define MPD_PLAYLIST_COMMANDS_HXX
 
 #include "CommandResult.hxx"
+#include "Compiler.h"
 
 class Client;
 
+gcc_const
+bool
+playlist_commands_available();
+
 CommandResult
 handle_save(Client &client, unsigned argc, char *argv[]);