sc: disable sc_apitest::ScTabViewObj::testGetReferredCells()

This was added in commit 600987b4
(tdf#45904 Move remaining _XCellRangeReferrer Java tests to C++,
2018-06-13), but as it was reported it fails on some Linux and Windows
machines.

Disable it till it's clear why that happens, as discussed at
<https://lists.freedesktop.org/archives/libreoffice/2018-July/080521.html>.

For the record, the failure what I can see is like this:

	xcellrangereferrer.cxx:32:Assertion
	Test name: sc_apitest::ScTabViewObj::testGetReferredCells
	equality assertion failed
	- Expected: Sheet: 0 StartColumn: 0 StartRow: 0 EndColumn: 6 EndRow: 22
	- Actual  : Sheet: 0 StartColumn: 0 StartRow: 0 EndColumn: 6 EndRow: 23

	Failures !!!
	Run: 6   Failure total: 1   Failures: 1   Errors: 0

Change-Id: I8057c938134b651b5f0f62fe07c2ef66a99d2e66
Reviewed-on: https://gerrit.libreoffice.org/57396
Tested-by: Jenkins
Reviewed-by: Jens Carl <j.carl43@gmx.de>

sc/qa/extras/sctabviewobj.cxx

@@ -55,7 +55,8 @@ public:
     CPPUNIT_TEST(testAddRemoveActivationEventListener);
 
     // XCellRangeReferrer
-    CPPUNIT_TEST(testGetReferredCells);
+    //Disabled till it's clear why it fails on some machines.
+    //CPPUNIT_TEST(testGetReferredCells);
 
     // XSpreadsheetView
     CPPUNIT_TEST(testGetSetActiveSheet);