Android CI: regression on `test_chmod::test_mode_after_dash_dash`

[niyaznigmatullin]

• Didn't fail before merging fix broken pipe error in tests/common/util #3910, fails everytime after on Android CI. I can't undestand how chmod and this test is related to the change in PR

---- test_chmod::test_mode_after_dash_dash stdout ----
current_directory_resolved: 
run: /data/data/com.termux/files/home/coreutils/target/debug/coreutils chmod -- -r file
chmod: file: new permissions are -wxrwxrwx, not -wx-wx-wx

thread 'test_chmod::test_mode_after_dash_dash' panicked at '"/data/data/com.termux/files/home/coreutils/target/debug/coreutils" "chmod" "--" "-r" "file": failed', /data/data/com.termux/files/home/coreutils/tests/by-util/test_chmod.rs:51:9

[jtracey]

This seems to have been fixed via #4005, though it's not clear why.