Don't use -sys in -rs with default features enabled

The -rs crate passes the features through one by one and enables them by
default by having them in its default config. However, disabling
features does not work, since -sys is always loaded with default
features. Therefore disable default features for -sys and everything
works as expected.

jpegxl-rs/Cargo.toml

@@ -38,6 +38,7 @@ byteorder = "1.5.0"
 [dependencies.jpegxl-sys]
 version = "0.10.3"
 path = "../jpegxl-sys"
+default-features = false
 
 [dev-dependencies]
 image = { version = "0.25.2", default-features = false, features = [