Support big endian system (#52) #96

Job	Run time
Info	3s
x86_64-windows-gnu(win7)	2m 6s
x86_64-macos-none	2m 54s
x86-windows-gnu(win7)	1m 38s
aarch64-macos-none	1m 22s
x86_64-windows-gnu	4m 13s
x86-windows-gnu	3m 34s
aarch64-windows-gnu	3m 28s
x86_64-linux-musl	2m 43s
aarch64-linux-musl	3m 2s
arm-linux-musleabi(cortex_a7)	2m 52s
arm-linux-musleabi(mpcorenovfp)	2m 45s
arm-linux-musleabi(pi_zero_w)	3m 14s
mipsel-linux-musl	2m 50s
mips-linux-musl	2m 44s
	39m 28s

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