Building OpenSSL from sources on Windows

Open third_party\poco\openssl\buildall.cmd. Tweak the config if needed.

Run buildall.cmd from Developer Command Prompt for VS 2019.

The resulting binaries are in VS_140 folder if buildall.cmd config was not changed. Replace the contents of build\win32 and/or build\win64 with the resulting binaries from VS_140 folder.