improve to select scheme version

[waruqi]

#7265 (comment)

[gemini-code-assist]

Summary of Changes

Hello @waruqi, 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 package version resolution process within Xmake. It introduces more robust logic for selecting package versions, particularly when dealing with schemes that may not have explicit version lists or when cryptographic verification is not required. The changes ensure a more predictable and flexible version selection, including a new fallback to use the user-specified version under specific conditions.

Highlights

• Improved Version Selection Logic: Enhanced package version selection logic to prioritize schemes with valid URLs and handle cases where version lists are absent or verification is skipped.
• Fallback to Required Version: Introduced a fallback mechanism to default to the explicitly required version when no suitable version is found through scheme analysis, aligning with issue #7245 breaks xmake-repo #7265.

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[gemini-code-assist]

Code Review

This pull request introduces a fallback mechanism for package version selection, allowing packages to use a specified version from add_requires even if no version is found through existing schemes. A new comment has been added to clarify the logic of a conditional check.