MDEV-10991: Server crashes in spider_udf_direct_sql_create_conn - tests in spider/oracle* suites crash the server

The fix for this bug was automatically merged from 10.1.  However, part of that
fix is unnecessary in 10.3.  This commit rolls back the part of the fix that is
unnecessary in 10.3.

Author:
  Jacob Mathew.

Reviewer:
  Kentoku Shiba.