hush: "adopt" ash var-utf8-length.tests

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

shell/ash_test/ash-vars/var-utf8-length.tests

@@ -1,2 +1,4 @@
+LANG=en_US.UTF-8
+LC_ALL=en_US.UTF-8
 X=abcdÉfghÍjklmnÓpqrstÚvwcyz
 echo ${#X}

shell/hush_test/hush-vars/var-utf8-length.right

@@ -0,0 +1 @@
+26

shell/hush_test/hush-vars/var-utf8-length.tests

@@ -0,0 +1,4 @@
+LANG=en_US.UTF-8
+LC_ALL=en_US.UTF-8
+X=abcdÉfghÍjklmnÓpqrstÚvwcyz
+echo ${#X}