Bug#202746: slightly more info for bogoutil segfault

[Clint Adams <schizo@debian.org>]

http://buildd.debian.org/build.php?arch=&pkg=bogofilter

    * 0.14.1.1-1 (arm) (latest build at Aug 1 21:45: maybe-failed)
    * 0.14.1.1-1 (mipsel) (latest build at Aug 1 21:40: maybe-failed)
    * 0.14.1.1-1 (mips) (latest build at Aug 1 21:58: maybe-failed)
    * 0.14.1.1-1 (hppa) (latest build at Aug 1 22:06: maybe-failed)
    * 0.14.1.1-1 (m68k) (latest build at Aug 1 23:02: maybe-failed)

These logs contain gdb backtraces (except when gdb wasn't happy).