Fix build on ancient openssl.

diff --git a/third_party/Csocket b/third_party/Csocket
index dd3d780c251e07dc40731d4ca603dc0e121e4db2..0d6d4ee0974ae32af43ff3f6747788aa0b44afe1 160000 (submodule)
--- a/third_party/Csocket
+++ b/third_party/Csocket
@@ -1 +1 @@
-Subproject commit dd3d780c251e07dc40731d4ca603dc0e121e4db2
+Subproject commit 0d6d4ee0974ae32af43ff3f6747788aa0b44afe1