fix(install.sh): support windows mingw platform

[ahaoboy]

 uname -s
MINGW64_NT-10.0-22635

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Latest commit: 85eccf2

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Name	Status	Preview	Comments	Updated (UTC)
fnm	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 30, 2024 3:45am

[Schniz]

woah, that's wonderful. thank you!