Update to v4.19 kernel headers.

Test: Builds and boots.
Change-Id: I99a9ed79666e143b47f02ca4e59eed94f69b7e4a
(cherry picked from commit a981e2e52e2e95a65fa9c9b6fb16dcb4c83dd576)
diff --git a/libc/kernel/uapi/linux/mroute.h b/libc/kernel/uapi/linux/mroute.h
index d962f8b..f0cb21b 100644
--- a/libc/kernel/uapi/linux/mroute.h
+++ b/libc/kernel/uapi/linux/mroute.h
@@ -103,6 +103,7 @@
   IPMRA_TABLE_MROUTE_DO_ASSERT,
   IPMRA_TABLE_MROUTE_DO_PIM,
   IPMRA_TABLE_VIFS,
+  IPMRA_TABLE_MROUTE_DO_WRVIFWHOLE,
   __IPMRA_TABLE_MAX
 };
 #define IPMRA_TABLE_MAX (__IPMRA_TABLE_MAX - 1)
@@ -141,4 +142,5 @@
 #define IGMPMSG_NOCACHE 1
 #define IGMPMSG_WRONGVIF 2
 #define IGMPMSG_WHOLEPKT 3
+#define IGMPMSG_WRVIFWHOLE 4
 #endif