build: avoid parsing possibly missing /etc/os-release #136
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Not all systems have
/etc/os-release(e.g., macOS).Checking it causes unnecessary build noise when the file is missing.
并非所有系统都有
/etc/os-release（例如 macOS）。检查该文件在缺失时会产生不必要的构建噪声。This PR instead checks for Gentoo-specific
/etc/gentoo-release, which is always present on Gentoo and avoids the error.本 PR 改为检查 Gentoo 特有的
/etc/gentoo-release， 该文件在 Gentoo 上必定存在，可避免错误。