Viktor Szakats

Just realized that the set of functions/macros in `lib/warnless.h` were created with a similar / overlapping goal as this PR. I'm thinking maybe after cherry-picking-off all the non-size_t (and alike)...

quiche / quiche has been consistently failing for the last few days; it's unrelated to this.

Closing in favour of #13501 and cherry-picking from there. It has the same commits as this one.

Is this useful? Do we want this?

Speaking of `-Xlink=-integritycheck`, is it correct, that this option makes Windows force-check the code signature at every run? Would that work with the self-signed signatures out of the box? (meaning...

> I obviously forgot about this. For self-signed certificates, the CA need to be installed. So integritycheck shouldn't be enabled by default, but I think curl-for-win should sign official builds...