Update libcss, rust-netsurfcss, rust-css

src/libcss

@@ -1 +1 @@
-Subproject commit e86543f5f41108b1765087dfa2b11bdc159facf4
+Subproject commit fa72e6b29671d70bd866052e55c930249cd2a3f9

src/rust-css

@@ -1 +1 @@
-Subproject commit 45c54188a79c35920df145cda7295558e4956c8e
+Subproject commit 79a3ddccd05742980c5e27e48755bec807d4bd46

src/rust-netsurfcss

@@ -1 +1 @@
-Subproject commit 7ee569d3e21ca2818f9bcc764a4abb313475e8cf
+Subproject commit 8b76c31e0d72b50630f56e5fb560eda4186c6796

src/servo/css/node_void_ptr.rs

@@ -0,0 +1,19 @@
+//! CSS library requires that DOM nodes be convertable to *c_void through this trait
+
+use dom::node::Node;
+
+// FIXME: Rust #3908. rust-css can't reexport VoidPtrLike
+extern mod netsurfcss;
+use netsurfcss::VoidPtrLike;
+
+impl Node: VoidPtrLike {
+    static fn from_void_ptr(node: *libc::c_void) -> Node {
+        assert node.is_not_null();
+        unsafe { cast::reinterpret_cast(&node) }
+    }
+
+    fn to_void_ptr(&self) -> *libc::c_void {
+        let node: *libc::c_void = unsafe { cast::reinterpret_cast(self) };
+        node
+    }
+}

src/servo/servo.rc

@@ -48,6 +48,7 @@ pub mod css {
     pub mod compute;
     priv mod select_handler;
     priv mod node_util;
+    priv mod node_void_ptr;
 }
 
 pub mod layout {