Add TCL_UTF_MAX log to status report

[michaelortmann]

Found by: michaelortmann
Patch by: michaelortmann
Fixes:

One-line summary:
Add TCL_UTF_MAX log to status report

Additional description (if needed):

Test cases demonstrating functionality (if applicable):

.status
[...]
Tcl library: /usr/lib/tcl8.6
Tcl version: 8.6.14 (header version 8.6.14)
Tcl is threaded.
Tcl TCL_UTF_MAX: 3
[...]

[vanosg]

Thanks for thinking of adding this, but with new Tcl about to come out and the user needing to specifically modify the source to get this value, we're not going to add more clutter to .status for this component.