diff --include option

[marty leisner]

I resurrected a patch I did to diff over a decade ago to give diff an 
--include option
(original patch is:
http://groups.google.com/group/gnu.utils.bug/browse_frm/thread/5aa53134278d7ef0?hl=en

Its very useful to be able to do:

diff -r --include='*.[ch]' --include=Makefile.am --include='*.glade' 
--exclude=GENFOO*.c -u -N proj1 mypatch-proj1

and it does the "right thing" without having to figure out what to exclude.

Its wrt diff 2.8.7.

marty

diff.patch
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