Only use 'extern crate stdweb' on web targets
The 'extern crate' declaration shouldn't be there even if the stdweb feature is on, unless the crate is being compiled for web.
@@ -127,7 +127,7 @@ extern crate bitflags;
#[cfg(any(target_os = "macos", target_os = "ios"))]
#[macro_use]
extern crate objc;
-#[cfg(feature = "std_web")]
+#[cfg(all(target_arch = "wasm32", feature = "std_web"))]
extern crate std_web as stdweb;
pub mod dpi;
