fix cfg

Author: newpavlov

src/lib.rs

@@ -227,7 +227,7 @@ cfg_if! {
                   target_env = "sgx",
               )))] {
         #[path = "rdrand.rs"] mod imp;
-    } else if #[cfg(target_arch = "wasm32-unknown-unknown")] {
+    } else if #[cfg(target_arch = "wasm32")] {
         cfg_if! {
             if #[cfg(feature = "wasm-bindgen")] {
                 #[path = "wasm32_bindgen.rs"] mod imp;