testsuite: fix runtest (File::Copy used in another place)

diff --git a/test/runtest b/test/runtest
index c9a07e0f8d2824ec529fef6c3af4d91a43b7efab..858617957572437c3da31bb4f33a4b54c400fcaa 100755 (executable)
--- a/test/runtest
+++ b/test/runtest
@@ -29,6 +29,7 @@ use File::Basename;
 use Pod::Usage;
 use Getopt::Long;
 use FindBin qw'$RealBin';
+use File::Copy;
 
 use lib "$RealBin/lib";
 use Exim::Runtest;