SquishTests: Adapt helper function

We nowadays have a couple of wizards where the build system
may end up being a specialized CMake selection.
Inside the tests we do not distinguish that deep so far, but
rely on single build system names.

Change-Id: Iacf824f526e746e466c4018592bc9cc8bdb9c1b8
Reviewed-by: Robert Löhning <robert.loehning@qt.io>

tests/system/shared/project.py

@@ -114,6 +114,8 @@ def __handleBuildSystem__(buildSystem):
     try:
         if buildSystem is None:
             buildSystem = str(comboObj.currentText)
+            if buildSystem.startswith("CMake"):
+                buildSystem = "CMake"
             test.log("Keeping default build system '%s'" % buildSystem)
         else:
             test.log("Trying to select build system '%s'" % buildSystem)