refactor: change posix_spawn path arg to use NixPath (#2596) #117

Job	Run time
minver	12s
macos	5m 2s
macos-aarch64	2m 47s
linux_native_builds (x86_64-unknown-linux-gnu)	3m 24s
rust_stable	1m 24s
rustfmt	16s
solaris (x86_64-pc-solaris)	3m 49s
linux_native_builds (x86_64-unknown-linux-musl)	3m 22s
tier3 (x86_64-unknown-dragonfly)	1m 0s
tier3 (x86_64-unknown-openbsd)	1m 0s
tier3 (x86_64-unknown-haiku)	58s
tier3 (armv7-unknown-linux-uclibceabihf)	1m 10s
tier3 (i686-unknown-hurd-gnu)	58s
redox	35s
cross (arm-unknown-linux-gnueabi)	1m 49s
cross_compiling (aarch64-linux-android)	36s
cross (armv7-unknown-linux-gnueabihf)	1m 50s
cross_compiling (arm-linux-androideabi)	35s
cross (i686-unknown-linux-gnu)	1m 50s
cross_compiling (armv7-linux-androideabi)	36s
cross (i686-unknown-linux-musl)	1m 59s
cross_compiling (i686-linux-android)	36s
cross (powerpc64le-unknown-linux-gnu)	1m 56s
cross_compiling (x86_64-linux-android)	34s
cross (loongarch64-unknown-linux-gnu)	1m 52s
cross_compiling (arm-unknown-linux-musleabi)	39s
cross_compiling (x86_64-unknown-fuchsia)	31s
cross_compiling (x86_64-unknown-illumos)	29s
cross_compiling (aarch64-apple-ios, true)	31s
cross_compiling (powerpc64-unknown-linux-gnu)	43s
cross_compiling (s390x-unknown-linux-gnu)	43s
cross_compiling (x86_64-unknown-linux-gnux32)	39s
cross_compiling (x86_64-unknown-netbsd)	33s
	44m 58s

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