MDEV-17615 cmake ssl error on musl/libressl

don't shortcut trying to test for openssl version,
test what is actually needed for a code to compile

cmake/ssl.cmake

@@ -71,15 +71,23 @@ MACRO (MYSQL_CHECK_SSL)
     FIND_LIBRARY(CRYPTO_LIBRARY crypto)
     MARK_AS_ADVANCED(CRYPTO_LIBRARY)
     INCLUDE(CheckSymbolExists)
+    INCLUDE(CheckCSourceCompiles)
     SET(CMAKE_REQUIRED_INCLUDES ${OPENSSL_INCLUDE_DIR})
     SET(CMAKE_REQUIRED_LIBRARIES ${OPENSSL_LIBRARIES})
     CHECK_SYMBOL_EXISTS(SHA512_DIGEST_LENGTH "openssl/sha.h" 
                         HAVE_SHA512_DIGEST_LENGTH)
     CHECK_SYMBOL_EXISTS(ERR_remove_thread_state "openssl/err.h"
                         HAVE_ERR_remove_thread_state)
+    CHECK_C_SOURCE_COMPILES("
+    #include <openssl/dh.h>
+    int main()
+    {
+      DH dh;
+      return sizeof(dh.version);
+      }" OLD_OPENSSL_API)
     SET(CMAKE_REQUIRED_INCLUDES)
     SET(CMAKE_REQUIRED_LIBRARIES)
-    IF(OPENSSL_FOUND AND OPENSSL_VERSION VERSION_LESS "1.1.0" AND
+    IF(OPENSSL_FOUND AND OLD_OPENSSL_API AND
        CRYPTO_LIBRARY AND HAVE_SHA512_DIGEST_LENGTH)
       SET(SSL_SOURCES "")
       SET(SSL_LIBRARIES ${OPENSSL_LIBRARIES} ${CRYPTO_LIBRARY})