build: fix make install with jimtcl

Update subproject jimtcl to fix issue with make install.
see jimtcl commit 373b721510fd2d0754a41cc70a3b7cfd02e929bd

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

diff --git a/jimtcl b/jimtcl
index f5e5c268eb800278a022c2f894ab2a8c277f0a4f..60dfb023c4afa95047e0fa8db49830ccb46446b2 160000 (submodule)
--- a/jimtcl
+++ b/jimtcl
@@ -1 +1 @@
-Subproject commit f5e5c268eb800278a022c2f894ab2a8c277f0a4f
+Subproject commit 60dfb023c4afa95047e0fa8db49830ccb46446b2