Suppress deprecation warnings in test of QDTE::timeSpec property

The tests are suitably #if-ed to be omitted once the property is gone,
but the compiler can still warn.

Change-Id: I20efcf9bb40fe6d7ad7e21b64e5400f71c0a0b15
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

tests/auto/widgets/widgets/qdatetimeedit/tst_qdatetimeedit.cpp

@@ -3501,6 +3501,8 @@ void tst_QDateTimeEdit::timeSpec_data()
     QTest::newRow("setTimeSpec") << false;
 }
 
+QT_WARNING_PUSH
+QT_WARNING_DISABLE_DEPRECATED
 void tst_QDateTimeEdit::timeSpec()
 {
     QFETCH(bool, useSetProperty);
@@ -3541,6 +3543,7 @@ void tst_QDateTimeEdit::timeSpec()
         QSKIP("Not tested in the GMT timezone");
     }
 }
+QT_WARNING_POP
 #endif // test deprecated timeSpec property
 
 void tst_QDateTimeEdit::timeZoneBug()