fcl-db: dbtestframework
* refine r26950: only use SET ANSI_NULL_DFLT_ON ON for MS SQL Server; Sybase ASE does not support it.



git-svn-id: http://svn.freepascal.org/svn/fpc/trunk@27019 3ad0048d-3df7-0310-abae-a5850022a9f2