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Sergei Nikulov authored
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: default avatarBrad King <brad.king@kitware.com>
ec80b1f4
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