Remove AVX2 compile option for x64 target #91

Job	Run time
build-natives / build-native-macos	28s
build-natives / build-native-linux (ubuntu-latest, x86-64)	34s
build-natives / build-native-windows	47s
build-natives / build-native-linux (ubuntu-24.04-arm, aarch64)	38s
gradle	1m 54s
	4m 21s

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