re-flex-4.5.0-bp160.1.8

- Update to version 4.5.0:
  * faster Matcher::find() with refactored SIMD
    (SSE2/AVX2/AVX512BW/NEON/AArch64) code like ugrep 6.0 and with
    run-time AVX2/AVX512BW detection increased default internal
    input buffer size
  * Improved Unicode support: respect Unicode word boundaries,
    support Unicode [::] character classes
  * improved FSM code generation
  * speed and usability improvements

- initial version