Fix the cmdlineargs tests on Buildkite (#42118)

DilumAluthge · KristofferC · commit efb8d9e4798e · 2021-09-07T18:05:30.000+02:00
(cherry picked from commit e1669b6)
diff --git a/test/cmdlineargs.jl b/test/cmdlineargs.jl
@@ -581,7 +581,7 @@ end
 
 
 # test error handling code paths of running --sysimage
-let exename = Base.julia_cmd()
+let exename = `$(Base.julia_cmd().exec[1]) -t 1`
     sysname = unsafe_string(Base.JLOptions().image_file)
     for nonexist_image in (
             joinpath(@__DIR__, "nonexistent"),
