Added missing headers to windows libraries

Two headers were missing from, and now added to
windows/dependencies/libraries: gd_io.h and gdfx.h

diff --git a/windows/dependencies/libraries b/windows/dependencies/libraries
index adbed28897131b16a0372b81269624c2bedfe472..95a696430d3c5ac67c3c122f951e42282bec5c86 160000 (submodule)
--- a/windows/dependencies/libraries
+++ b/windows/dependencies/libraries
@@ -1 +1 @@
-Subproject commit adbed28897131b16a0372b81269624c2bedfe472
+Subproject commit 95a696430d3c5ac67c3c122f951e42282bec5c86