Mark a few tests as "not autotests".

So "make check" doesn't find them, since they are more system tests
than automatic unit tests (since they access the real MM backends).

Change-Id: I3322b4206bce16a97c28753b80c0ed5dc0bb250e
Reviewed-on: http://codereview.qt.nokia.com/2599
Reviewed-by: Qt Sanity Bot <qt_sanity_bot@ovi.com>
Reviewed-by: Michael Goddard <michael.goddard@nokia.com>

tests/auto/qsoundeffect/qsoundeffect.pro

@@ -2,8 +2,8 @@ load(qttest_p4)
 
 QT += core declarative multimediakit-private
 
-# temporarily blacklist test because it fails
-CONFIG += insignificant_test
+# This is more of a system test
+CONFIG -= testcase
 
 SOURCES += tst_qsoundeffect.cpp