[sr #110325] autoupdate introduces a second invocation of AC_OUTPUT

Update of sr #110325 (project autoconf):

                Priority:              5 - Normal => 1 - Later              

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Follow-up Comment #1:

Regrettably, I do not think it will be possible to make any improvements to
autoupdate for 2.70.  The algorithm it uses is already extremely brittle and
I'm buried in regressions in automake itself.

(What's going on here is, autoupdate runs M4 with an unusual set of macro
definitions active: `AC_OUTPUT` is recognized as a macro, but `dnl` *isn't*. 
It's just another word.  It might not be possible to improve the handling of
this case without a new feature in M4 itself -- allowing more than one comment
starter to be active at once.)

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