[PATCH] tests: also unset _STDBUF_E, _STDBUF_I and _STDBUF_O

[Jim Meyering]

FYI, I noticed the getenv calls in libstdbuf.c and realized
that these three new variables could perturb tests, so have
added them to the list in tests/envvar-check:

>From 3e7a1473ae41440bd5e8b62f0532ac99a112f7bd Mon Sep 17 00:00:00 2001
From: Jim Meyering <address@hidden>
Date: Wed, 28 Dec 2011 18:01:01 +0100
Subject: [PATCH] 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.
---
 tests/envvar-check |    3 +++
 1 files changed, 3 insertions(+), 0 deletions(-)

diff --git a/tests/envvar-check b/tests/envvar-check
index 5a2ffbe..8695f2a 100644
--- 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
--
1.7.8.1.391.g2c2ad