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- Support enabling strong crypto via optional user cipher list when USE_STRONG_CRYPTO or SCH_USE_STRONG_CRYPTO is in the list. MSDN says SCH_USE_STRONG_CRYPTO "Instructs Schannel to disable known weak cryptographic algorithms, cipher suites, and SSL/TLS protocol versions that may be otherwise enabled for better interoperability." Ref: https://curl.se/mail/lib-2021-02/0066.html Ref: https://curl.se/docs/manpage.html#--ciphers Ref: https://curl.se/libcurl/c/CURLOPT_SSL_CIPHER_LIST.html Ref: https://docs.microsoft.com/en-us/windows/win32/api/schannel/ns-schannel-schannel_cred Closes https://github.com/curl/curl/pull/6734