[MERGE] Handle references to line data in _patiencediff_c.c properly

[Lukáš Lalinský]

This code is called in bzrlib only with lists or tuples of strings,
which works fine, because PySequence_Fast always returns the same object
and so the items from PySequence_Fast_GET_ITEM will not be deleted until
the original sequence is deleted. But if it's called with a sequence
than needs to be converted to list (e.g. PyUnicode), the items will be
garbage collected in the contructor and still used later in code (which
leads to segfaults).

I really don't how to write a failing test for something like this, so
there are no tests in the patch. :(

Lukas

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