ignore_assert_list using full path names after switch to cmake

_From [derek.br...@gmail.com](https://code.google.com/u/117968039472581148324/) on July 30, 2009 09:51:22_

this is PR 410916

the switch to cmake put in absolute path names for files, making
ignore_assert_list harder and less portable to use. the plan is to have
the core strip off all but the file name (which is unique) to address the
issue.

_Original issue: http://code.google.com/p/dynamorio/issues/detail?id=183_