FindOpenSSL: Add target ``OpenSSL::applink`` for OpenSSL's applink utility

gnaggnoyilrequested to merge
gnaggnoyil/cmake:master into master

This MR proposes a target called OpenSSL:applink and a variable OPENSSL_APPLINK_SOURCES in Modules/FindOpenSSL.cmake to provide this feature, as described in the code.

Fixes: #20701 (closed)
Topic-rename: FindOpenSSL-applink

Edited by Brad King

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