Add perl modeline to Configure scripts

Encourages GitHub to perform proper syntax highlighting.

Reviewed-by: Rich Salz <rsalz@openssl.org>
Reviewed-by: Richard Levitte <levitte@openssl.org>

Configure

diff --git a/Configure b/Configure
index c53c316..e344d05 100755
--- a/Configure
+++ b/Configure
@@ -1,3 +1,4 @@
+# -*- mode: perl; -*-
 :
 eval 'exec perl -S $0 ${1+"$@"}'
     if $running_under_some_shell;