signal 11 crash fixed

[David Bobroff]

I updated from CVS a short time ago (v2.1.25/ChangLog 1.1733) and
compiled Lily.

I then immediately ran 'wrong.ly'(the example I sent to the list) and it
went off without a hitch.  I didn't tweak any flag settings or anything,
just:

make clean
./autogen.sh
make all 
make install

...and the "signal 11" error did not appear.

I haven't done anything else with it just yet, but I thought you would
like to have that bit of feedback.

-David