One last test failure: ECL on Linux

[Robert Goldman]

test-xach-update-bug.script fails on both ECL and ECL bytecodes for me
on Linux.  This is ECL 13.5.1.

I *believe* that this is to be expected, and there's an ECL fix for this.

Please LMK if that's not true and if I should hold up releasing 3.1.6
for that reason.

Otherwise I plan to release today (assuming I can get the necessary time
from work).