Temporarily mark ctest testcases as insignificant on Windows

The deployment of cmake onto Windows test machines caused test failures
with no changes to the code under test.  Mark all the ctest tests as
insignificant until the failures can be fixed.

Change-Id: If0cd4001ae6ec49fd38b9e0f97dd5326fddae433
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>

mkspecs/features/ctest_testcase.prf

@@ -44,6 +44,9 @@ isEmpty(CMAKE_VERSION) {
     }
 }
 
+# tests not yet verified as working correctly on Windows
+win32:CONFIG += insignificant_test
+
 insignificant_test:!isEmpty(check.commands) {
     check.commands = -$${check.commands}
 }