issue with Microsoft compiler

[Vincent Lefevre]

On 2023-02-13 11:54:50 +0100, Marc Glisse wrote:
> Another option, if it is just the one place in gmp.h, would be to replace -X
> with 0-X (or the uglier ~X+1 but that does not seem necessary).

I find 0-X much uglier and it could even more deserve a warning due to
the use of mixed signed-unsigned arithmetic, which can often lead to
unexpected results on some platforms (e.g. whether long = int or not).

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