tests: also unset _STDBUF_E, _STDBUF_I and _STDBUF_O

* tests/envvar-check (vars): Add these to the list of envvars we
ignore: _STDBUF_E, _STDBUF_I, _STDBUF_O, used by libstdbuf.

diff --git a/tests/envvar-check b/tests/envvar-check
index 5a2ffbe8f542209d0ab67eec702b8800ebeb9acc..8695f2a86bf54fd087add8708fb4e155fc9c3960 100644 (file)
--- a/tests/envvar-check
+++ b/tests/envvar-check
@@ -25,6 +25,9 @@ fi
 envvar_check_fail=0
 vars='
   _POSIX2_VERSION
+  _STDBUF_E
+  _STDBUF_I
+  _STDBUF_O
   BLOCKSIZE
   BLOCK_SIZE
   CDPATH