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Version 2.46.5
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Update dependent crates that had security vulnerabilities:

  generic-array to 0.12.4 - RUSTSEC-2020-0146  
  smallvec to 0.6.14      - RUSTSEC-2021-0003

There are no changes to the library code.

- Fix bash-isms in Makefile.am (Tin-Wei Lan).

- Fix Visual Studio build (Chun-wei Fan).