jimtcl: update to support --disable-install-jim

Update jimtcl version to commit 6233a6c5d39928f1bfafa8f41cb1ddf0c5a83de0
This enable to to build jimtcl as a submodule but not install it.

Signed-off-by: Spencer Oliver <ntfreak@users.sourceforge.net>

diff --git a/jimtcl b/jimtcl
index 60dfb023c4afa95047e0fa8db49830ccb46446b2..6233a6c5d39928f1bfafa8f41cb1ddf0c5a83de0 160000 (submodule)
--- a/jimtcl
+++ b/jimtcl
@@ -1 +1 @@
-Subproject commit 60dfb023c4afa95047e0fa8db49830ccb46446b2
+Subproject commit 6233a6c5d39928f1bfafa8f41cb1ddf0c5a83de0