Segfault on exit

Imported from http://bugzilla.roxen.com/bugzilla/show_bug.cgi?id=1279

Reported by Stefan Berndtsson, GU stefan@nocrew.org

When compiling 7.2 (and 7.3) on Linux/PPC (running Debian), it compiles fine, but when pike is being run (like in "make verify"), it always exits with a Segmentation Fault. This does not happen on Linux/x86 with the same source. Both CVS and D.Hedbor's latest snapshots have been tested.

A quick backtrace from GDB looks like this:

$ ulimit -c unlimited
$ ./test-pike
Pike v7.3 release 2 running Hilfe v2.0 (Incremental Pike Frontend)
> exit(1);
Segmentation fault (core dumped)
$ gdb ./test-pike core
GNU gdb 5.0
[..snipped license stuff..]
(gdb) bt
#0  0xfe634e4 in __deregister_frame_info () from /lib/libc.so.6
#1  0xffbabc0 in dlopen () from /lib/libm.so.6
#2  0xffd545c in llroundf () from /lib/libm.so.6
#3  0x3000f130 in _dl_fini () at dl-fini.c:170
#4  0xfd95d8c in exit () from /lib/libc.so.6
#5  0x1007adc8 in low_init_main ()
#6  0x1007ad84 in pike_do_exit ()
#7  0xfd7fe68 in __libc_start_main () from /lib/libc.so.6

The current libc used is debian's 2.2.2-1 but 2.1.3-13 has been tested with the same result.