[PATCH] newlib: fix build with <gcc-5 versions

[Mike Frysinger]

On 14 Mar 2022 08:36, Sebastian Huber wrote:
> On 14/03/2022 04:25, Mike Frysinger wrote:
> > __builtin_mul_overflow showed up with gcc-5, so stub it out for older
> > versions.
> 
> The __builtin_mul_overflow() performs a multiplication and an overflow 
> check. Just replacing this with 0 is not the same.

i'm aware it does the check.  i figured since <gcc-5 isn't that common, it
isn't worth the effort doing the ad-hoc ({...}) function definition trying
to maintain the same semantics.  although it should at least do the actual
multiplication & assignment.
-mike
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