libdispatch: add package

[star-hengxing]

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[gemini-code-assist]

Summary of Changes

Hello @star-hengxing, 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 integrates the libdispatch (Grand Central Dispatch) library into the project's build system by adding a new package definition. This change facilitates the seamless building, installation, and testing of libdispatch, a crucial concurrency framework, across various platforms. The primary goal is to make libdispatch readily available for use within the project's ecosystem, ensuring robust concurrency support.

Highlights

• New Package Definition: Introduced a new xmake.lua file to define the libdispatch package, enabling its integration and management within the build system.
• Build Configuration: Configured the build process for libdispatch using CMake, including setting build types (Debug/Release) and shared library options. A specific modification was added to disable -Werror during compilation.
• Dependency Management: Specified platform-specific system library dependencies for Windows (e.g., shlwapi, ws2_32) and Linux/BSD (e.g., pthread, rt), ensuring correct linking across different operating systems.
• Version and Source Control: Defined package versions (6.1.1 and git:6.1.1) and provided URLs to the official swift-corelibs-libdispatch GitHub repository for source retrieval.

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[gemini-code-assist]

Code Review

This pull request adds a new package for libdispatch. The package definition is a good start, but there are a few issues to address. I've found a critical issue regarding a missing dependency on libblocksruntime which will likely cause build failures. There is also a high-severity issue with handling macOS, where libdispatch is a system library. Finally, I've made a medium-severity suggestion to improve the package's metadata for better maintainability. Please see the detailed comments for suggestions.