[PATCH] Fix test suite under Perl 5.26

[Daniel Colascione]

Make the test suite work properly now that "." is no longer in @INC

diff --git a/tests/tools.at b/tests/tools.at
index a4a7dd77..e9a62408 100644
--- a/tests/tools.at
+++ b/tests/tools.at
@@ -1386,7 +1386,7 @@ do
   funny=`func_sanitize_file_name "$funny"`
   file=" file $funny"
   dir=`func_sanitize_dir_name " dir $funny"`
-  TMPDIR=" tmp$dir"
+  TMPDIR="./ tmp$dir"
   export TMPDIR

   # skip if we cannot create such a file or directory