[sr #111396] autoheader check needs to handle ancient header

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Follow-up Comment #2, sr #111396 (group autoconf):=0A=0AThis seems to work =
at a quick try:=0A        && $firstline !~ /^\/\* .*\.  Generated( automati=
cally)? from .* by=0Aautoheader\.  \*\//=0A=0ABut not very confident in tha=
t being sufficiently portable or correct.=0A=0A=0A    _____________________=
__________________________________=0A=0AReply to this item at:=0A=0A  <http=
s://savannah.gnu.org/support/?111396>=0A=0A________________________________=
_______________=0AMessage sent via Savannah=0Ahttps://savannah.gnu.org/=0A
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