AC_FUNC_ALLOCA shouldn't define prototype

[Thomas Klausner]

Hi!

Joerg Sonnenberger recently committed the attached patch to pkgsrc
(for autoconf-2.66) prohibiting AC_FUNC_ALLOCA from defining a
prototype on the BSDs.

The reason was:
Do not fall through to the implicit prototype as it conflicts with
stdlib.h.

Please include (something like) this in the next autoconf release.

Thanks,
 Thomas

patch-aa
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