Use trap not kill in seccomp filter

Bug: 34647665
Test: Make sure boots, check that causing a seccomp failure creates a
      crash dump

Change-Id: I5ab2fe3e8322a3c38318c97d343834baa874af8d
diff --git a/libc/tools/genseccomp.py b/libc/tools/genseccomp.py
index b82bb12..bd003a3 100755
--- a/libc/tools/genseccomp.py
+++ b/libc/tools/genseccomp.py
@@ -126,7 +126,7 @@
              ", 0, " + str(len(bpf)) + "),")
 
   # Add the error and allow calls at the end
-  bpf.append("BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_KILL),")
+  bpf.append("BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_TRAP),")
   bpf.append("BPF_STMT(BPF_RET|BPF_K, SECCOMP_RET_ALLOW),")
 
   # And output policy