Hello, Automake gurus.

I have a special case for bug#54063. In my case, the .texi file is 
missing during 'automake' time, because it is being created by 
'configure' from a matching .texi.in file. That file exists during 
'automake' time, so it can be scanned for the output filename - no 
need to use /dev/null in such simple case.

The attached patch (with a test) should fix this issue. Hope I've done 
everything the right way.

-- 
Regards - Bogdan ('bogdro') D.                 (GNU/Linux & FreeDOS)
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