perl: bump the required Perl version to 5.8 from 5.6.[21]

diff --git a/t/t7006/test-terminal.perl b/t/t7006/test-terminal.perl
index 73ff80937195f3ee8d4bf647a6c06bef23bb8891..6b5f22ae4a3ca96a22fa0a7d77bac1b59e747b00 100755 (executable)
--- a/t/t7006/test-terminal.perl
+++ b/t/t7006/test-terminal.perl
@@ -1,4 +1,5 @@
 #!/usr/bin/perl
+use 5.008;
 use strict;
 use warnings;
 use IO::Pty;