skip IndexPath test on linux

Author: kastiglione

lldb/test/API/lang/swift/foundation_value_types/indexpath/TestSwiftFoundationTypeIndexPath.py

@@ -13,4 +13,4 @@
 from lldbsuite.test.decorators import *
 
 lldbinline.MakeInlineTest(__file__, globals(),
-                          decorators=[swiftTest,skipIf(oslist=['windows'])])
+                          decorators=[swiftTest,skipIf(oslist=['windows', 'linux'])])