Remove printf from backend

luigi/backend/ffisdl.lua

@@ -184,8 +184,6 @@ Backend.print = function (text, x, y)
     sdl.renderCopy(renderer, texture, nil, sdl.Rect(x, y, surface.w, surface.h))
 end
 
-Backend.printf = Backend.print
-
 Backend.getClipboardText = function ()
     return ffi.string(sdl.getClipboardText())
 end

luigi/backend/love.lua

@@ -35,8 +35,6 @@ Backend.drawRectangle = love.graphics.rectangle
 
 Backend.print = love.graphics.print
 
-Backend.printf = love.graphics.printf
-
 Backend.getClipboardText = love.system.getClipboardText
 
 Backend.setClipboardText = love.system.setClipboardText