Use the winapi crate instead of our own ffi

src/win32/gl.rs

@@ -0,0 +1,26 @@
+/// WGL bindings
+pub mod wgl {
+    generate_gl_bindings! {
+        api: "wgl",
+        profile: "core",
+        version: "1.0",
+        generator: "static"
+    }
+}
+
+/// Functions that are not necessarly always available
+pub mod wgl_extra {
+    generate_gl_bindings! {
+        api: "wgl",
+        profile: "core",
+        version: "1.0",
+        generator: "struct",
+        extensions: [
+            "WGL_ARB_create_context",
+            "WGL_EXT_swap_control"
+        ]
+    }
+}
+
+#[link(name = "opengl32")]
+extern {}