fix: wasi fd subject to garbage collection on unix #10

Job	Run time
Build TinyGo test binary	13s
Build Zig test binary	7s
Go (ubuntu-22.04, Go-1.21, amd64, baseline-compiler)	3m 10s
Go (js) (ubuntu-22.04)	36s
Go (macos-12, Go-1.21, amd64, baseline-compiler)	5m 12s
wasi-testsuite (ubuntu-22.04)	29s
Go (js) (macos-12)	38s
Go (windows-2022, Go-1.21, amd64, baseline-compiler)	3m 38s
wasi-testsuite (macos-12)	1m 2s
wasi-testsuite (windows-2022)	56s
Go (ubuntu-22.04, Go-1.21, arm64, optimizing-compiler)	16m 52s
Zig (ubuntu-22.04, amd64, baseline-compiler)	3m 57s
Zig (macos-12, amd64, baseline-compiler)	7m 8s
Zig (windows-2022, amd64, baseline-compiler)	7m 23s
Zig (ubuntu-22.04, arm64, optimizing-compiler)	9m 3s
TinyGo (ubuntu-22.04, amd64, baseline-compiler)	31s
TinyGo (macos-12, amd64, baseline-compiler)	1m 5s
TinyGo (windows-2022, amd64, baseline-compiler)	2m 10s
TinyGo (ubuntu-22.04, arm64, optimizing-compiler)	5m 16s
	1h 9m 26s

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