SERVER-15480 Comment out CursorPointsToSamePlaceRegardlessOfDirection

This test fails on **OS X 10.8 C++11 DEBUG** due to an invalid static cast in both `Heap1BtreeImpl::ForwardCursor::pointsToSamePlaceAs` and `Heap1BtreeImpl::ReverseCursor::pointsToSamePlaceAs`.

https://jira.mongodb.org/browse/SERVER-15480