Update to v4.17.3 kernel headers.

Test: Builds, boots on a walleye.
Change-Id: I389d8b61ec00ea309e38d1b1a2e0dace48c21edb
diff --git a/libc/kernel/uapi/linux/bpf_perf_event.h b/libc/kernel/uapi/linux/bpf_perf_event.h
index 7a8d212..190b916 100644
--- a/libc/kernel/uapi/linux/bpf_perf_event.h
+++ b/libc/kernel/uapi/linux/bpf_perf_event.h
@@ -22,5 +22,6 @@
 struct bpf_perf_event_data {
   bpf_user_pt_regs_t regs;
   __u64 sample_period;
+  __u64 addr;
 };
 #endif