Spirv builder cleanup #1273

Job	Run time
cargo-deny	1m 7s
Compiletest (ubuntu-24.04)	8m 3s
Lint	5m 43s
Compiletest (windows-2022)	16m 26s
Android (ubuntu-24.04, aarch64-linux-android)	8m 32s
Test (windows-2022)	19m 4s
Compiletest (macOS-latest)	8m 4s
Difftest (macOS-latest)	14m 22s
Difftest (windows-2022)	25m 14s
Test (ubuntu-24.04)	11m 17s
Test (macOS-latest)	15m 18s
Difftest (ubuntu-24.04)	13m 30s
test_success	4s
	2h 26m 44s

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