Fix use_in_file_templates! with jRuby on Windows
Fix use_in_file_templates! with jRuby on Windows

It's actually a workaround for a jRuby issue.

  http://jira.codehaus.org/browse/JRUBY-61

Signed-off-by: Simon Rozet <088e16a1019277b15d58faf0541e11910eb756f6@rozet.name>

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