tests/misc/printenv.sh: env/printenv: reverse sort order on aarch64

[Bernhard Voelker]

On aarch64, we're experiencing a test failure in tests/misc/printenv.sh
on the openSUSE Build Service: the output of 'env' is sorted exactly
in reverse order compared to that of 'printenv'.

https://build.opensuse.org/package/live_build_log/Base:System/coreutils-testsuite/openSUSE_Factory_ARM/aarch64

However, if I apply the following patch, then the test would succeed:

https://build.opensuse.org/package/live_build_log/home:bernhard-voelker:aarch64/coreutils-testsuite/openSUSE_Factory_ARM/aarch64

--- a/tests/misc/printenv.sh
+++ b/tests/misc/printenv.sh
@@ -23,7 +23,7 @@ print_ver_ printenv
 # printenv as a builtin, so we must invoke it via "env".
 # But beware of $_, set by many shells to the last command run.
 # Also, filter out LD_PRELOAD, which is set when running under valgrind.
-env | grep -Ev '^(_|LD_PRELOAD=)' > exp || framework_failure_
+env -- env | grep -Ev '^(_|LD_PRELOAD=)' > exp || framework_failure_
 env -- printenv | grep -Ev '^(_|LD_PRELOAD=)' > out || fail=1
 compare exp out || fail=1

I'm not 100% sure what's happening here. According to 'which' and 'type',
both 'env' and 'printenv' are called correctly from src/:

[ 1718s] + which env
[ 1718s] /home/abuild/rpmbuild/BUILD/coreutils-8.23/src/env
[ 1718s] + which printenv
[ 1718s] /home/abuild/rpmbuild/BUILD/coreutils-8.23/src/printenv
[ 1718s] + type env
[ 1718s] env is hashed (/home/abuild/rpmbuild/BUILD/coreutils-8.23/./src/env)
[ 1718s] + type printenv
[ 1718s] printenv is /home/abuild/rpmbuild/BUILD/coreutils-8.23/./src/printenv

Any idea what's happening here?
I could prepare a proper patch for the above diff, but I'd prefer
to understand why this would make a difference.
Did I miss the obvious?

Thanks & have a nice day,
Berny