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

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Follow-up Comment #1, sr #111396 (group autoconf):=0A=0ATrivial testcase as=
 ofllows.=0A=0Aconfigure.ac:=0A=0AAC_INIT([foo], [1.0])=0AAC_CONFIG_HEADERS=
([config.h])=0AAC_OUTPUT=0A=0A=0Aconfig.h.in:=0A=0A/* config.h.in.  Generat=
ed automatically from configure.ac by autoheader.  */=0A=0A/* Define to the=
 address where bug reports for this package should be sent.=0A*/=0A#undef P=
ACKAGE_BUGREPORT=0A=0A/* Define to the full name of this package. */=0A#und=
ef PACKAGE_NAME=0A=0A/* Define to the full name and version of this package=
. */=0A#undef PACKAGE_STRING=0A=0A/* Define to the one symbol short name of=
 this package. */=0A#undef PACKAGE_TARNAME=0A=0A/* Define to the home page =
for this package. */=0A#undef PACKAGE_URL=0A=0A/* Define to the version of =
this package. */=0A#undef PACKAGE_VERSION=0A=0A=0A=0A$ ORIGINAL_MTIME=3D$(s=
tat -c %Y config.h.in)=0A$ autoconf --force=0A$ autoheader --force=0A$ NEW_=
MTIME=3D$(stat -c %Y config.h.in)=0A$ [ "${ORIGINAL_MTIME}" =3D "${NEW_MTIM=
E}" ] && printf "didn't update config.in=0Aas expected\n"=0A=0A=0AWith --re=
place-handwritten, it is updated as expected.=0A=0A=0A    _________________=
______________________________________=0A=0AReply to this item at:=0A=0A  <=
https://savannah.gnu.org/support/?111396>=0A=0A____________________________=
___________________=0AMessage sent via Savannah=0Ahttps://savannah.gnu.org/=
=0A
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