build(boring-sys): add loongarch conditional compilation patch

[0x676e67]

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[gemini-code-assist]

Summary of Changes

Hello @0x676e67, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refines the build process by introducing conditional compilation for a loongarch specific patch. This ensures that the boringssl-loongarch.patch is only applied when building for the loongarch64 architecture, thereby optimizing the build system and preventing irrelevant patch applications on other platforms.

Highlights

• Conditional Patch Application: The boringssl-loongarch.patch is now applied conditionally, specifically for the loongarch64 target architecture.
• Build System Optimization: This change prevents the loongarch patch from being applied unnecessarily on other architectures, streamlining the build process.

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[gemini-code-assist]

Code Review

This pull request correctly adds a conditional compilation flag to the build script. This ensures that the LoongArch-specific patch is only applied when the compilation target is loongarch64. This change improves the build process by preventing an unnecessary and potentially problematic patch application on other architectures. The implementation is clean and follows idiomatic Rust practices.