Expose seccomp table

Test: Run with internal cl
      https://googleplex-android-review.git.corp.google.com/#/c/2028102/
      and make sure passes
Bug: 20890063
Change-Id: Id78e5ea843554a5d3750b8f9b350f28ad4dca99b
diff --git a/libc/seccomp/include/seccomp_policy.h b/libc/seccomp/include/seccomp_policy.h
index 33b5d0e..397f8e4 100644
--- a/libc/seccomp/include/seccomp_policy.h
+++ b/libc/seccomp/include/seccomp_policy.h
@@ -17,6 +17,10 @@
 #ifndef SECCOMP_POLICY_H
 #define SECCOMP_POLICY_H
 
+#include <stddef.h>
+#include <linux/filter.h>
+
 bool set_seccomp_filter();
+void get_seccomp_filter(const sock_filter*& filter, size_t& filter_size);
 
 #endif