Re: intprops.h xalloc-oversized.h: fix typos and port to gcc-7

[Paul Eggert]

Jim Meyering wrote:

> Good catch.
> Thanks.

In trying it out on GNU Emacs with GCC 6.2 I ran into another problem: it 
complains at compile-time if __builtin_add_overflow's 3rd arg is null. In some 
GCC versions this is supposed to discard the value, but I guess that capability 
is superseded by __builtin_add_overflow_p. So I installed the attached 
additional patch, which avoids the need for a null argument so we don't have to 
worry about GCC version details there.

0001-intprops.h-port-recent-changes-to-GCC-6.2.0.patch
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