Import ruby18-rbx-require-relative pacakge version 0.0.5.

It is required by new ruby-linecache package.

Ruby 1.9's relative_relative for Rubinus and MRI 1.8

Here we add in Module RequireRelative method: *require_relative*,
and *abs_file*.

Example:
require 'rubygems'; require 'require_relative'
require_relative './lib/foo'
absolute_path = RequireRelative.abs_file

But why *abs_file*? Well, recall that ==__FILE__== does not give an absolute
path. So if you have chdir'd before using ==__FILE__==, you might not be
able to retrieve the full path.

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