The attached patch fixes gdb.base/bang.exp so that it accepts
sim's output.

The current test always fails with sim.

(gdb) run
Starting program:
/project/m32r-tools/insight-20030703/build/gdb/testsuite/gdb.base/bang!
0

*** EXIT code 0

Program exited normally.
[Switching to process 0]
(gdb) FAIL: gdb.base/bang.exp: run program (the program exited)