Merge pull request #4243 from shuujii/remove-definition-of-sprintf-in-mruby-print

Remove definition of `Kernel#sprintf` in `mruby-print`

mrbgems/mruby-print/mrblib/print.rb

@@ -52,9 +52,6 @@ module Kernel
     def printf(*args)
       raise NotImplementedError.new('printf not available')
     end
-    def sprintf(*args)
-      raise NotImplementedError.new('sprintf not available')
-    end
   else
     def printf(*args)
       __printstr__(sprintf(*args))