Import Tcl 8.6.11

tests/result.test

@@ -10,8 +10,10 @@
 # See the file "license.terms" for information on usage and redistribution
 # of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 
-package require tcltest 2
-namespace import ::tcltest::*
+if {"::tcltest" ni [namespace children]} {
+    package require tcltest 2.5
+    namespace import -force ::tcltest::*
+}
 
 ::tcltest::loadTestedCommands
 catch [list package require -exact Tcltest [info patchlevel]]