require autoconf-2.69 exactly

[Mike Frysinger]

i have no plans on fighting how gcc/binutils/gdb/etc... manage their autotools
integration.  it's not what i do in any of my projects (i never commit any of
these generated files), but it's what the canonical toolchain projects have
opted to do, and newlib is part of that ecosystem.

i wish you all the best in convincing gcc/binutils/gdb/etc... to change their
ways ;).
-mike
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