appliance: Remove LD_PRELOAD=libSegFault.so

This feature was removed in glibc 2.35:
https://savannah.gnu.org/forum/forum.php?forum_id=10111

appliance/init

@@ -17,16 +17,6 @@ if [ ! -d /tmp ] || [ ! -d /var/tmp ]; then
     chmod 1777 /tmp /var/tmp
 fi
 
-# Try to print a stack trace for segfaults inside the appliance.
-for d in /lib64 /lib; do
-  f=$d/libSegFault.so
-  if [ -f "$f" ]; then
-    LD_PRELOAD=$f
-    export LD_PRELOAD
-    break
-  fi
-done
-
 mkdir -p /proc /sys
 mount -t proc /proc /proc
 mount -t sysfs /sys /sys

daemon/guestfsd.c

@@ -104,16 +104,6 @@ main (int argc, char *argv[])
   if (winsock_init () == -1)
     error (EXIT_FAILURE, 0, "winsock initialization failed");
 
-  /* XXX The appliance /init script sets LD_PRELOAD=../libSegFault.so.
-   * However if we CHROOT_IN to the sysroot that file might not exist,
-   * resulting in all commands failing.  What we'd really like to do
-   * is to have LD_PRELOAD only set while outside the chroot.  I
-   * suspect the proper way to solve this is to remove the
-   * CHROOT_IN/_OUT hack and replace it properly (fork), but that is
-   * for another day.
-   */
-  unsetenv ("LD_PRELOAD");
-
   struct stat statbuf;
   if (stat ("/", &statbuf) == 0)
     root_device = statbuf.st_dev;