Guess at Windows link flags because I can't get a local build system working

diff --git a/storage/possum/lib b/storage/possum/lib
index 603497f852c2082a8b6b2a5503171e1695f63d85..8e1d5c11b75ba54925742358447a30e00470fb73 160000 (submodule)
--- a/storage/possum/lib
+++ b/storage/possum/lib
@@ -1 +1 @@
-Subproject commit 603497f852c2082a8b6b2a5503171e1695f63d85
+Subproject commit 8e1d5c11b75ba54925742358447a30e00470fb73