RubyIO tweak

RubyIOTweak.java

    public IRubyObject stat(ThreadContext context) {
        openFile.checkClosed(context.getRuntime());
        try {
            if(this.popenSpecial == true) {
                /*
                This seems to work in OSX, but not Windows. I'm not sure how the impl of
                file descriptors differs in Win32. Any ideas?
                */
                int fd = (int)this.fileno(context).getLongValue();
                // ends up calling POSIX.fstat(int)
                return context.getRuntime().newFileStat(fd);
            }  else {
                return context.getRuntime().newFileStat(getOpenFileChecked().getMainStreamSafe().getDescriptor().getFileDescriptor());
            }

        } catch (BadDescriptorException e) {
            throw context.runtime.newErrnoEBADFError();
        }
    }