fix: if no native library is available for this arch, don't include in classpath

packages/app-lib/src/launcher/args.rs

@@ -55,15 +55,11 @@ pub fn get_class_paths(
                 return None;
             }
 
-            if !library.include_in_classpath {
+            if !library.include_in_classpath || library.is_native() {
                 return None;
             }
 
-            Some(get_lib_path(
-                libraries_path,
-                &library.name,
-                library.native_classifier(java_arch).is_some(),
-            ))
+            Some(get_lib_path(libraries_path, &library.name, false))
         }))
         .process_results(|iter| {
             iter.unique().join(classpath_separator(java_arch))

packages/app-lib/src/launcher/download.rs

@@ -890,7 +890,16 @@ pub async fn download_libraries(
                 return Ok(());
             }
 
-            // When a library has natives, we only need to download such natives, as PrismLauncher does
+			if library.is_native()
+				&& library.native_classifier(java_arch).is_none()
+			{
+				tracing::trace!(
+					"Skipped incompatible native library {}",
+					&library.name
+				);
+				return Ok(());
+			}
+
 				if let Some((url, sha1, size)) =
 					library.native_download(java_arch)?
             {

packages/app-lib/src/launcher/library.rs

@@ -6,6 +6,9 @@ use minecraft_meta_manifest::{
 use url::Url;
 
 pub(crate) trait LibraryExt {
+    /// Whether this library declares platform-specific native classifiers.
+    fn is_native(&self) -> bool;
+
     /// Native classification does not depend on classifier download metadata.
     fn native_classifier(&self, java_arch: &str) -> Option<String>;
 
@@ -17,6 +20,12 @@ pub(crate) trait LibraryExt {
 }
 
 impl LibraryExt for Library {
+    fn is_native(&self) -> bool {
+        self.natives
+            .as_ref()
+            .is_some_and(|natives| !natives.is_empty())
+    }
+
     /// Native classification does not depend on classifier download metadata.
     fn native_classifier(&self, java_arch: &str) -> Option<String> {
         let natives = self.natives.as_ref()?;