Appveyor: OpenSSL version mismatch in unit tests, 2019 edition

crypto/openssl_version: [forking] 
  FAIL ../src/test/test_crypto.c:237: OpenSSL library version 1.1.1d did not begin with header version 1.1.1c.
  [openssl_version FAILED]

https://ci.appveyor.com/project/torproject/tor/builds/28757237/job/ul9m0fnglaqtw3oy?fullLog=true#L3511

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