info_TEXINFOS should not assume source file exists

[Noah Slater]

Hello,

I generate my "foo.texi" Texinfo documentation from DocBook
("foo.dbk") and using the info_TEXINFOS rule in my Makefile.am causes
automake to check for "foo.texi" before completing.

As "foo.texi" is generated by a rule in my Makefile I have to have my
bootstrap script touch the "foo.texi" file and then cat some content
in to it to fool automake.

I would expect automake to to perform this check at all.

Thanks,

Noah

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