c9s / r3 / 6612099824

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Use PCRE2 instead of PCRE (#153)

PCRE is now at end of life and is no longer actively maintained.
Lift the dependency to the next major version, i.e. PCRE2.

Implementation notes:
- Removed the pcre study option since:
  "The new API ... was simplified by abolishing the separate "study" optimizing
  function; in PCRE2, patterns are automatically optimized where possible."
- If asprintf() fails the content of the 'strp' variable is undefined.
  Lets check the return value and return NULL upon error.
- Pattern and subject can straightforwardly be cast to PCRE2_SPTR since we
  only work with 8-bit code units.

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