Opt into features to silence warnings

build.rs

@@ -1,4 +1,5 @@
 #![allow(unstable)]
+#![feature(old_io,old_path,os)]
 extern crate gl_generator;
 extern crate khronos_api;
 

src/lib.rs

@@ -1,4 +1,4 @@
-#![feature(unsafe_destructor)]
+#![feature(unsafe_destructor,core,std_misc)]
 #![unstable]
 #![allow(unstable)]