Improve OptionalObsoleteFiles.inc

[Warren Block]

On Tue, 5 Oct 2010, Alexander Leidinger wrote:
>
> We do not have a target which allows to go to src/bin/XXX and run "make 
> deinstall" or similar. What is correctly written in this thread is that "make 
> check-old" and "make delete-old" (and "make delete-old-libs") is supposed to 
> do what you want (given that there is already support in the src to exclude 
> this part of FreeBSD during installation). The most up-to-date version is in 
> -current, I do not know about the stable branches (I do not monitor if people 
> which change the corresponding file have merged the changes to stable 
> branches or not).
>
> What may not be 100% correct in src is the list of files to delete (= a bug). 
> For this the suggestion in the thread is also correct, if there is something 
> which does not work please send a PR.

This would be more accurate and require less maintenance if 
OptionalObsoleteFiles.inc were auto-generated ala genplist.  Don't know 
if that's practical, just wanted to suggest it.