Add LIST_FOR_EACH_SAFE Helper

[Robert Shearman]

Hi,

Adding this macro would be useful for an OLE patch I am writing. It adds 
a macro that will iterate the list in a way that is safe against removal 
so that an entry isn't skipped when the previous entry is removed.

Rob

Changelog:
Add LIST_FOR_EACH_SAFE - a list iteration macro that is safe against 
removal.
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