Auto merge of #30082 - semarie:execve, r=alexcrichton
Auto merge of #30082 - semarie:execve, r=alexcrichton

under OpenBSD and Bitrig, it is an error to pass an empty argv
argument to execve(2). It results the test fail as execve(2) don't exec
and set errno to EINVAL.

instead, make argv with two arguments (in order to differenciate the
initial call, from the execve call).

r? @alexcrichton

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