pull in latest src-netbsd, updates to NetBSD 7.99.1 kernel

diff --git a/rumpsrc b/rumpsrc
index 4f12231283246b0bd73cddd93d8cb205aface4c1..3687f55f417008a1fcdc04195644009232ae609d 160000 (submodule)
--- a/rumpsrc
+++ b/rumpsrc
@@ -1 +1 @@
-Subproject commit 4f12231283246b0bd73cddd93d8cb205aface4c1
+Subproject commit 3687f55f417008a1fcdc04195644009232ae609d