Get rid of infinite recursion in expanding a load path to the real
path while loading a transcoder.
Related issues
Bug #16382: SystemStackError thrown when running `LC_ALL="C" RUBYLIB=".:" ruby -E cp932:utf-8 aaa.rb` from where the current dir contains Japanese characters
Fixed stack overflow [Bug #16382]
Get rid of infinite recursion in expanding a load path to the real
path while loading a transcoder.