set_at now take intptr_t for x, y instead of int, and guards 32-bit architectures

[oddbookworm]

Fixes #2961
@ankith26 figured out that it was an int overflow when multiplying surf->pitch by y

[bilhox]

I don't like how the problem is solved, we aren't clamping the line in the clip rect so we have to check if each pixel of the line one by one are outside the clip rect. IMO, the best way to solve this problem is to delimit with new coordinates which part of the line is going to be drawn.

[ankith26]

LGTM, thanks 🎉