Auto merge of #41039 - alexcrichton:process-poll, r=nagisa
Auto merge of #41039 - alexcrichton:process-poll, r=nagisa

std: Use `poll` instead of `select`

This gives us the benefit of supporting file descriptors over the limit that
select supports, which...

Closes #40894

GBGamer/rust,aidancully/rust,graydon/rust,GBGamer/rust,GBGamer/rust,graydon/rust,GBGamer/rust,graydon/rust,aidancully/rust,GBGamer/rust,graydon/rust,GBGamer/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,aidancully/rust