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
Set CMAKE_REQUIRED_DEFINITIONS to include definitions needed to get the winsock2 API from windows.h. Simplify the order of checks to avoid extra conditions. Use check_include_file instead of check_include_file_concat to look for OpenSSL headers. They do not need to participate in a sequence of dependent system headers. Also they may cause winsock.h to be included before ws2tcpip.h, causing the latter to not be detected in the sequence. Reviewed-by: Brad King <brad.king@kitware.com>