Sed -- deleting to line BEFORE regexp match

[Stainless Steel Gerbil [Joe Beckenbach]]

In his article Robert Lupton (lupton at uhccux.uhcc.hawaii.edu) writes:
>I have a patch generator (a script using diff -c, of course), and I want
>to exclude the patches for certain files. So I want to delete all lines
>from 
>
>diff -c -r old_file new_file
>...
>diff -c -r OLD_FILE NEW_FILE
>
>(but keeping the second diff line), using sed. 

	Can you spare an extra pass on it? If so, just duplicate the
last line and then delete from the first to the second inclusive.

<inews fodder>
<inews fodder>
<inews fodder>
<inews fodder>
<inews fodder>
<inews fodder>
<inews fodder>
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