[update] api detection logic.

Author: vmarcella

crates/lambda-rs-platform/src/gfx/api.rs

@@ -14,11 +14,7 @@ if #[cfg(feature = "gfx-with-gl")] {
   pub use gfx_backend_dx12 as RenderingAPI;
 } else if #[cfg(all(feature = "detect-platform"))] {
   pub use default_backend as RenderingAPI;
-} else if #[cfg(all(feature = "detect-platform", target_os = "macos"))] {
-    pub use gfx_backend_metal as RenderingAPI;
-} else if #[cfg(all(feature = "detect-platform", unix, not(target_os = "macos")))] {
-    pub use gfx_backend_gl as RenderingAPI;
 } else {
-    panic!("No supported GPU API found for the current platform.");
+    pub use gfx_backend_empty as RenderingAPI;
   }
 }