MDEV-27540 Different OpenSSL versions mix up in build depending on cmake options

list ${OPENSSL_ROOT_DIR}/lib64 explicitly, because
cmake below version 3.23.0 won't search there.

cmake/ssl.cmake

@@ -113,7 +113,8 @@ MACRO (MYSQL_CHECK_SSL)
          )
     IF(NOT OPENSSL_ROOT_DIR)
       IF(WITH_SSL_PATH)
-        SET(OPENSSL_ROOT_DIR ${WITH_SSL_PATH})
+        # workaround for https://gitlab.kitware.com/cmake/cmake/-/issues/22945
+        SET(OPENSSL_ROOT_DIR ${WITH_SSL_PATH} ${WITH_SSL_PATH}/lib64)
       ENDIF()
     ENDIF()
     FIND_PACKAGE(OpenSSL)