Log Message:
Updated py-mssql to 0.7.4.

Changes:
New features:
 - implemented set_query_timeout() and set_login_timeout()
 - implemented min_error_severity property: all errors that
   has severity less than min_error_severity doesn't raise
   exception, but are still available in errmsg()
 - stdmsg() is now deprecated; all errors can be retrieved
   using errmsg(); stdmsg() will disappear some time in the
   future
 - readded ntwdblib.dll; I misunderstood its licence-it's
   redistributable; this library is at the newest available
   version so connections to SQL 2005 are possible
 - new unit test provided by Jakub Labath
 - the web page has now more useful info
Bugfixes:
 - sometimes exceptions were raised but error message was
   lost
 - the coltype wasn't set to NUMBER for float types (thanks
   Jakub Labath)

Patch provided by bartosz\@atom.eu.org in PR 33070.