Rollup merge of #46943 - malbarbo:process-test-busybox, r=alexcrichton
Rollup merge of #46943 - malbarbo:process-test-busybox, r=alexcrichton

Fix process test when using busybox mkdir

busybox mkdir . returns 0
busybox mkdir ./ returns 1

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