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>

jimtcl @ 6233a6c5

-Subproject commit 60dfb023c4afa95047e0fa8db49830ccb46446b2
+Subproject commit 6233a6c5d39928f1bfafa8f41cb1ddf0c5a83de0