This test was failing in some environments.

* tests/ls/color-dtype-dir: Don't rely on eval "`dircolors -b`"
to set LS_COLORS in the environment.
* tests/envvar-check: Instead, ensure that LS_COLORS is not set.
Reported by Bob Proulx.

tests/envvar-check

@@ -33,6 +33,7 @@ vars='
   DF_BLOCK_SIZE
   DU_BLOCK_SIZE
   LS_BLOCK_SIZE
+  LS_COLORS
   POSIXLY_CORRECT
   SIMPLE_BACKUP_SUFFIX
   TIME_STYLE

tests/ls/color-dtype-dir

@@ -48,19 +48,16 @@ fi
 
 fail=0
 
-# Ensure that LS_COLORS is set to known values.
-eval "`dircolors -b`"
-
 ls --color=always > out || fail=1
 cat -A out > o1 || fail=1
 echo >> o1 || fail=1
 mv o1 out || fail=1
 
 cat <<\EOF > exp || fail=1
-^[[00m^[[01;34md^[[00m$
-^[[34;42mother-writable^[[00m$
-^[[00mout^[[00m$
-^[[37;44msticky^[[00m$
+^[[0m^[[01;34md^[[0m$
+^[[34;42mother-writable^[[0m$
+^[[0mout^[[0m$
+^[[37;44msticky^[[0m$
 ^[[m
 EOF