Move JRuby's ext and loader script #39
Merged
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The strscan.rb file is only needed by JRuby, which does not have an extension file format that loads itself. As noted in #35 having this file present on TruffleRuby prevents their built-in strscan.rb from loading, so the file was moved to lib/jruby/strscan.rb with lib/jruby added as a require path. However this results in both lib/strscan.rb and lib/jruby/strscan.rb getting copied into JRuby's stdlib when the default gem is installed, leading to the confusing situation in #38.
This PR moves the jruby-specific strscan.rb under the jruby extension, renaming that directory to be explicitly for JRuby, and adding that new ext/jruby/lib path to the require paths so there's no nesting of require paths to copy files multiple times.
Fixes #38