runtests: drop ref to unused external function [ci skip]

Follow-up to 3585796049aa5c8cc2ef4e4fa3ac289b0d5ed85c #16452

diff --git a/tests/runtests.pl b/tests/runtests.pl
index 68582382be380ddf2dd7a1506f1af4bd2ae34a9c..00c5427874e95d7d1590ccc1393d63d885999584 100755 (executable)
--- a/tests/runtests.pl
+++ b/tests/runtests.pl
@@ -88,7 +88,6 @@ use serverhelp qw(
     server_exe
     );
 use pathhelp qw(
-    exe_ext
     sys_native_current_path
     );
 use processhelp qw(