Canonicalize CARGO_MANIFEST_DIR in case it's set as a relpath and causes crashes FileAssetIo's strip_prefix.

Author: golddranks

crates/bevy_asset/src/io/file_asset_io.rs

@@ -64,7 +64,8 @@ impl FileAssetIo {
     /// instead. It's set by cargo when running with `cargo run`.
     pub fn get_base_path() -> PathBuf {
         if let Ok(manifest_dir) = env::var("CARGO_MANIFEST_DIR") {
-            PathBuf::from(manifest_dir)
+            fs::canonicalize(&manifest_dir)
+                .unwrap_or_else(|_| PathBuf::from(manifest_dir))
         } else {
             env::current_exe()
                 .map(|path| {