Added WASI support to mozjs (WIP) #5

Job	Run time
linux (--features debugmozjs)	42s
linux	49s
android	1m 44s
integrity	50s
linux (aarch64-unknown-linux-gnu)	1m 29s
linux (armv7-unknown-linux-gnueabihf)	1m 47s
mac (--features debugmozjs)	5m 25s
windows (--features debugmozjs, x86_64-pc-windows-msvc)	3m 4s
mac	6m 2s
windows (--features debugmozjs, aarch64-pc-windows-msvc)	3m 30s
windows (x86_64-pc-windows-msvc)	3m 3s
windows (aarch64-pc-windows-msvc)	3m 51s
Result	4s
	32m 20s

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