autoconf-2.69 pkgsrc patch

[Thomas Klausner]

Hi!

Jörg Sonnenberger added the attached patch to the autoconf package in
pkgsrc in 2010; it seems the patch still isn't integrated, so I
thought I'd send it upstream.

The commit message was: AC_FUNC_ALLOCA should never define a prototype
on the BSDs. (The patch comment is "Do not fall through to the
implicit prototype as it conflicts with stdlib.h.")

Please include it in the next release.

Thanks,
 Thomas

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