Add SDL2 & C-powered window handling compatibility. #1529

Job	Run time
cargo check (msrv) (wasm32)	44s
cargo check (msrv) (windows-latest)	1m 31s
cargo check (aarch64-android)	25s
cargo clippy (windows-latest)	2m 9s
cargo check (msrv) (macos-latest)	57s
cargo clippy (macos-latest)	1m 15s
cargo check (msrv) (ubuntu-latest)	48s
cargo clippy (wasm32)	1m 29s
cargo doc	1m 9s
cargo clippy (ubuntu-latest)	1m 30s
cargo fmt	24s
Prime LFS Cache	8s
cargo test (wasm32)	47s
typos	4s
cargo test (windows-latest)	2m 3s
cargo test (macos-latest)	1m 22s
cargo test (ubuntu-latest)	3m 3s
	19m 48s

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