Revert "don't build with OpenSSL 3.0, it doesn't work before MDEV-25785"

This reverts commit c9beef43, because
we have OpenSSL 3.0 support here.

part of MDEV-29000

cmake/ssl.cmake

@@ -118,7 +118,7 @@ MACRO (MYSQL_CHECK_SSL)
     ENDIF()
     FIND_PACKAGE(OpenSSL)
     SET_PACKAGE_PROPERTIES(OpenSSL PROPERTIES TYPE RECOMMENDED)
-    IF(OPENSSL_FOUND AND OPENSSL_VERSION AND OPENSSL_VERSION VERSION_LESS "3.0.0")
+    IF(OPENSSL_FOUND)
       SET(OPENSSL_LIBRARY ${OPENSSL_SSL_LIBRARY})
       INCLUDE(CheckSymbolExists)
       SET(SSL_SOURCES "")