[flext] "Bus Error" if a thread-based external is replaced

[Spencer Russell]

I'm on Ubuntu 10.10, running pdextended 0.42.5

Steps to reproduce:
copy the thread2 tutorial example external to your PD path
open the attached simple patch
copy the thread2 again while the patch is running

behavior:
PD will crash with a bus error.

backtrace:

#0  0x00007fffe82125a9 in flext_multi::ThrCond::TimedWait(double) ()
   from /home/srussell/pd-externals/thread2.pd_linux
#1  0x00007fffe821c044 in flext_base_multi::QWorker(flext_multi::thr_params*)
    () from /home/srussell/pd-externals/thread2.pd_linux
#2  0x00007fffe821328c in ?? ()
   from /home/srussell/pd-externals/thread2.pd_linux
#3  0x00007ffff703c971 in start_thread () from /lib/libpthread.so.0
#4  0x00007ffff6d9891d in clone () from /lib/libc.so.6
#5  0x0000000000000000 in ?? ()
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