Disable GameCube adapter on Windows (#80)

## Summary
- add a feature flag for the GameCube adapter driver
- keep the driver enabled by default on supported platforms
- exclude the adapter dependency and polling systems on Windows

Reviewed-on: #80
Co-authored-by: Álex Román Núñez <eirexe@eirteam.moe>

Cargo.toml

@@ -7,9 +7,10 @@ authors = [""]
 [workspace]
 
 [features]
-default = ["development", "debug_features"]
+default = ["development", "debug_features", "gamecube-adapter"]
 development = ["bevy/dynamic_linking", "bevy/file_watcher", "bevy/embedded_watcher"]
 debug_features = ["bevy/free_camera"]
+gamecube-adapter = ["dep:gc-adapter-neo"]
 
 [dependencies]
 bevy = { version = "0.19", features = ["asset_processor", "basis-universal", "compressed_image_saver", "bevy_settings"] }
@@ -34,7 +35,6 @@ strum = "0.28.0"
 strum_macros = "0.28.0"
 bevy_asset_loader = "0.27.0"
 ron_asset_manager = "0.9.0"
-gc-adapter-neo = { version = "1.1.1", features = ["libusb"] }
 rhai = "1.26.0"
 enum_cycling = "0.2.1"
 enum_cycling_derive = "0.2.1"
@@ -49,3 +49,6 @@ inherits = "release"
 lto = "thin"
 codegen-units = 1
 strip = "symbols"
+
+[target.'cfg(not(target_os = "windows"))'.dependencies]
+gc-adapter-neo = { version = "1.1.1", features = ["libusb"], optional = true }