som.c patch to include alloca-conf.h

[Alan Modra]

On Sun, 24 Sep 2000, John David Anglin wrote:

> This patch is needed to build som.c with the native hp compiler.

This is OK to commit, along with alloca-conf.h, provided you also update
som.c dependencies in Makefile.am and Makefile.in  "make dep-am; automake"
should do it for you, but please sanity check via cvs diff.

Alan Modra
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