Codechange: replace error/usererror printf variant with fmt variant and rename

src/bootstrap_gui.cpp

@@ -10,6 +10,7 @@
 #include "stdafx.h"
 #include "base_media_base.h"
 #include "blitter/factory.hpp"
+#include "error_func.h"
 
 #if defined(WITH_FREETYPE) || defined(WITH_UNISCRIBE) || defined(WITH_COCOA)
 
@@ -334,6 +335,6 @@ bool HandleBootstrap()
 
 	/* Failure to get enough working to get a graphics set. */
 failure:
-	usererror("Failed to find a graphics set. Please acquire a graphics set for OpenTTD. See section 1.4 of README.md.");
+	UserError("Failed to find a graphics set. Please acquire a graphics set for OpenTTD. See section 1.4 of README.md.");
 	return false;
 }