sandbox: Allow backtrace signals to be disabled

Part of 31614.

src/lib/sandbox/sandbox.c

@@ -295,6 +295,7 @@ sb_rt_sigaction(scmp_filter_ctx ctx, sandbox_cfg_t *filter)
   unsigned i;
   int rc;
   int param[] = { SIGINT, SIGTERM, SIGPIPE, SIGUSR1, SIGUSR2, SIGHUP, SIGCHLD,
+                  SIGSEGV, SIGILL, SIGFPE, SIGBUS, SIGSYS, SIGIO,
 #ifdef SIGXFSZ
       SIGXFSZ
 #endif