Modern releases of Tcl (8.5 and later?) require use the special
procedure "unknown" to implement some autoloading functionality.
Dejagnu replaces "unknown" with its own definition, without chaining
to the original version of "unknown". This causes "clock format
[clock seconds]" to fail while trying to load the "msgcat" Tcl
Use "exec date" instead of "clock format [clock seconds]" to work
around this bug.
(Also needs pullup to 1.7.)
Commit By: tlyu