[add] features back for conditionally compiling naga.

Author: vmarcella

crates/lambda-rs-platform/src/shader/mod.rs

@@ -6,7 +6,10 @@ pub use types::{
   VirtualShader,
 };
 
+#[cfg(feature = "shader-backend-naga")]
 mod naga;
+
+#[cfg(feature = "shader-backend-naga")]
 pub use naga::{
   ShaderCompiler,
   ShaderCompilerBuilder,