fix gateway path for non-macOS Apple platforms #206

Job	Run time
Rustfmt	10s
Check (windows-latest)	49s
Check (macOS-latest)	16s
Check (ubuntu-latest)	19s
Cross compile (i686-unknown-linux-musl)	34s
Cross compile (aarch64-linux-android)	55s
Cross compile (armv7-linux-androideabi)	56s
Cross compile (x86_64-unknown-linux-musl)	42s
Cross compile (x86_64-unknown-netbsd)	40s
Cross compile (x86_64-unknown-freebsd)	44s
	6m 5s

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