Revert "Convert exclusions to los_def."

This reverts commit 7afa089db8b01b1810c5903309f7302545638550.

los_def is currently buggy, leading to weird behaviour when deleting exclusions.

Created by  Robert Vollmert  on October 25, 2009
7K2MOEL4VXTJG2XV575MS3YHL7VWWYBROAV5RCWUBFSF25XXV4XAC
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