Remove deprecated 'allow' lint

build.rs

@@ -1,4 +1,3 @@
-#![allow(unstable)]
 #![feature(old_io,old_path,os)]
 extern crate gl_generator;
 extern crate khronos_api;

src/lib.rs

@@ -1,6 +1,5 @@
 #![feature(unsafe_destructor,core,std_misc)]
 #![unstable]
-#![allow(unstable)]
 
 //! The purpose of this library is to provide an OpenGL context on as many
 //!  platforms as possible.