[vello_shaders] Bring back the Bazel build hack #1371

Job	Run time
cargo clippy (windows-latest)	2m 25s
cargo check (aarch64-android)	18s
cargo clippy (macos-latest)	1m 2s
cargo check (msrv) (wasm32)	42s
cargo clippy (ubuntu-latest)	1m 20s
cargo check (msrv) (windows-latest)	1m 27s
cargo check (msrv) (macos-latest)	38s
cargo check (msrv) (ubuntu-latest)	39s
cargo clippy (wasm32)	1m 13s
cargo fmt	32s
cargo doc	20s
cargo test (windows-latest)	1m 53s
cargo test (wasm32)	29s
cargo test (macos-latest)	34s
typos	4s
cargo test (ubuntu-latest)	2m 15s
	15m 51s

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