Remove workaround for the `__wasm_signal` symbol #22

Job	Run time
macOS (x86_64-apple-darwin)	1m 37s
Style check	17s
Docker Linux Tier1 (i686-unknown-linux-gnu)	3m 13s
Windows (x86_64-pc-windows-gnu, 64, x86_64)	3m 54s
Docker Linux Tier1 (x86_64-unknown-linux-gnu)	3m 21s
Windows (x86_64-pc-windows-msvc)	3m 28s
Windows (i686-pc-windows-msvc)	3m 26s
	19m 16s

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