Make the cmake test insignificant in QtTools on Mac.

Recent qtbase changes seem to have broken it.

Change-Id: Ie596e8b8b5bd8c6cb804c84808595a2388a2bfef
Reviewed-by: Stephen Kelly <stephen.kelly@kdab.com>

tests/auto/cmake/cmake.pro

@@ -3,5 +3,5 @@
 TEMPLATE = subdirs
 
 # QtUiTools test fail on Windows/MSVC because it's a static library - QTBUG-27087
-win32:CONFIG += insignificant_test
+if(win32|mac):CONFIG += insignificant_test
 CONFIG += ctest_testcase