jimtcl: update jim to fix make clean bug

jimtcl 0.73 has a issue when make clean is called.
we have only included that fix as this is close to a release to update
to jimtcl master.

Change-Id: I5791ff32a98bd76e52feb9475605cbecf58420e5
Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-on: http://openocd.zylin.com/638
Tested-by: jenkins