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Use safe printf functions for Wii U code

--- a/src/Backends/WiiU/Misc.cpp

+++ b/src/Backends/WiiU/Misc.cpp

@@ -145,7 +145,7 @@

 	va_list argument_list;

 	va_start(argument_list, format);

-	vsprintf(message_buffer, format, argument_list);

+	vsnprintf(message_buffer, sizeof(message_buffer), format, argument_list);

 	va_end(argument_list);

 	WHBLogPrint("ERROR:");

@@ -158,7 +158,7 @@

 	va_list argument_list;

 	va_start(argument_list, format);

-	vsprintf(message_buffer, format, argument_list);

+	vsnprintf(message_buffer, sizeof(message_buffer), format, argument_list);

 	va_end(argument_list);

 	WHBLogPrint("INFO:");