Fix calling Exit() from within a Python function action, so that it gets detected and exits with the specified value under Python versions before 2.5, by explicitly catching and re-raising the SystemExit exception.
Fix calling Exit() from within a Python function action, so that it gets
detected and exits with the specified value under Python versions before
2.5, by explicitly catching and re-raising the SystemExit exception.


git-svn-id: 7892167f69f80ee5d3024affce49f20c74bcb41d@3752 fdb21ef1-2011-0410-befe-b5e4ea1792b1

azverkan/scons,azverkan/scons,azverkan/scons,azverkan/scons,azverkan/scons