fix dynamic plugin example

Cargo.toml

@@ -47,6 +47,7 @@ glam = "0.8.6"
 [workspace]
 members = [
     "crates/*",
+    "examples/dynamic_plugin_loading/example_plugin"
 ]
 
 [dev-dependencies]

crates/bevy_derive/src/lib.rs

@@ -476,7 +476,7 @@ pub fn derive_app_plugin(input: TokenStream) -> TokenStream {
 
     TokenStream::from(quote! {
         #[no_mangle]
-        pub extern "C" fn _create_plugin() -> *mut bevy::app::plugin::AppPlugin {
+        pub extern "C" fn _create_plugin() -> *mut bevy::app::AppPlugin {
             // TODO: without this the assembly does nothing. why is that the case?
             print!("");
             // make sure the constructor is the correct type.

examples/dynamic_plugin_loading/example_plugin/src/lib.rs

@@ -4,8 +4,8 @@ use bevy::prelude::*;
 pub struct ExamplePlugin;
 
 impl AppPlugin for ExamplePlugin {
-    fn build(&self, app_builder: AppBuilder) -> AppBuilder {
-        app_builder.setup(setup)
+    fn build(&self, app_builder: &mut AppBuilder) {
+        app_builder.add_startup_system(setup);
     }
 }
 
@@ -40,6 +40,5 @@ pub fn setup(world: &mut World, resources: &mut Resources) {
                 Vec3::new(0.0, 0.0, 1.0),
             )),
             ..Default::default()
-        })
-    .build();
+        });
 }

examples/dynamic_plugin_loading/main.rs

@@ -5,7 +5,7 @@ fn main() {
         .add_default_plugins()
         .load_plugin(concat!(
             env!("CARGO_MANIFEST_DIR"),
-            "/examples/dynamic_plugin_loading/example_plugin/target/release/libexample_plugin.so"
+            "/target/debug/libexample_plugin.so"
         ))
         .run();
 }