bug#65491: [PATCH] Improve performance allocating vectors

[Eli Zaretskii]

> From: Mattias Engdegård <mattias.engdegard@gmail.com>
> Date: Tue, 19 Sep 2023 15:28:41 +0200
> Cc: Paul Eggert <eggert@cs.ucla.edu>,
>  65491@debbugs.gnu.org,
>  monnier@iro.umontreal.ca
> 
> Here it is. Very straightforward: just flip a cast and remove unused 
> definitions.

Builds okay on MS-Windows (with wide-ints) and on GNU/Linux (64-bit
build).

Thanks.