[poppler] "-?" and "--help" are exceptionally(?) unavailable in pdftohtml

[suzuki toshiya]

Hi,

Today I found that most utilities in "utils" (pdftoppm, pdftotext,
pdftocairo, etc) accept all of "-h", "-?", "-help", "--help" options,
but pdftohtml accepts only "-h" and "-help". It is not a bug, but
doing as others would be more intuitive, slightly.

Attached is a patch for such purpose. Please consider!

Regards,
mpsuzuki
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