Untracked test-cases in testlib selftests

After running qtbase/tests/auto/testlib/selftests/generate_expected_output.py without arguments, I'm left with many expected_*.* files in the selftests/ directory that are not previously present:

	tests/auto/testlib/selftests/expected_benchlibcallgrind.txt
	tests/auto/testlib/selftests/expected_crashes.*
	tests/auto/testlib/selftests/expected_deleteLater.*
	tests/auto/testlib/selftests/expected_deleteLater_noApp.*
	tests/auto/testlib/selftests/expected_printdatatags.*
	tests/auto/testlib/selftests/expected_printdatatagswithglobaltags.*

are all reported by git as untracked.
If there is a reason why these are not saved in git, generate_expected_output.py should skip generating them (and document why they are not tracked). Otherwise, they should be added.