Use "set -euo pipefail" in test-no_std.sh.

This makes it consistent with other shell scripts in the repo.

cranelift/test-no_std.sh

@@ -1,11 +1,9 @@
 #!/bin/bash
+set -euo pipefail
 
 # This is the test script for testing the no_std configuration of
 # packages which support it.
 
-# Exit immediately on errors.
-set -e
-
 # Repository top-level directory.
 cd $(dirname "$0")
 topdir=$(pwd)