spurious warning C4189 local variable initialized but not referenced

Change-Id: I1162ad2b222445b61a3cc3c6314c74b1b11f5483

sc/qa/unit/subsequent_export-test.cxx

@@ -2152,6 +2152,7 @@ void ScExportTest::testPivotTableTwoDataFieldsXLSX()
             }
 
             const char* pNames[] = { "Name", "Value" };
+            (void) pNames;
 
             size_t nCount = pCache->GetFieldCount();
             if (nCount != SAL_N_ELEMENTS(pNames))