Attempt to fix windows builds by passing /bigobj. #4

Job	Run time
build (linux, x86_64, ubuntu-20.04)	9m 8s
build (windows, x86_32, windows-latest)	20m 24s
build (windows, x86_64, windows-latest)	18m 47s
build (macos, universal, macos-latest)	15m 39s
build (android, arm64, ubuntu-20.04)	8m 53s
build (android, arm32, ubuntu-20.04)	9m 8s
build (android, x86_64, ubuntu-20.04)	5m 33s
build (android, x86_32, ubuntu-20.04)	7m 53s
build (ios, arm64, macos-latest)	2m 44s
build (web, wasm32, ubuntu-20.04)	10m 53s
	1h 49m 2s

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