@JohnTitor: no appropriate reviewer found, use r? to override

So, we need to change the time_t definition on musl 32-bit targets according to "time64": https://musl.libc.org/time64.html
I think we should do it at some point but should announce it via deprecation notes or something else for a while before changing.

I'm going to close this for now since the change for time_t needs some time.