fix: (cmake) Correctly set QT_VERSION_MAJOR and find Qt6 private modules

[hillwoodroc]

The previous CMake logic used find_package(QT NAMES Qt6 ...) followed by if(Qt6_VERSION VERSION_GREATER_EQUAL 6.10) to conditionally find private modules, but Qt6_VERSION is not set by this call. As a result, Qt6 private modules (CorePrivate, GuiPrivate, WidgetsPrivate) were never found, causing link errors on targets depending on them.

This patch updates the logic to:

• Set QT_VERSION_MAJOR and QT_VERSION_MINOR based on the public Qt6/Qt5 version variables, preserving existing version checks in the project.
• Conditionally find Qt6 private modules using find_package(Qt6 CONFIG REQUIRED COMPONENTS CorePrivate GuiPrivate WidgetsPrivate) when Qt6 >= 6.10.
• Maintain compatibility with Qt5 builds.

This ensures private modules are correctly linked when available and prevents undefined reference errors.

[deepin-ci-robot]

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[github-actions]

Note

[静态代码检查]

• 敏感词检查失败, 检测到1个文件存在敏感词

详情

{
    "CMakeLists.txt": [
        {
            "line": "  HOMEPAGE_URL \"https://github.com/linuxdeepin/qt5integration\"",
            "line_number": 15,
            "rule": "S35",
            "reason": "Url link | cc21178aa0"
        }
    ]
}

[BLumia]

请求修改的是下面那个问题。上面那个QT_VERSION_MAJOR未定义的情况希望能详细描述下场景（因为理论上不应该发生这个情况，如果发生了则可能是有别的什么问题）。

[github-actions]

Note

[静态代码检查]

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详情

{
    "CMakeLists.txt": [
        {
            "line": "  HOMEPAGE_URL \"https://github.com/linuxdeepin/qt5integration\"",
            "line_number": 15,
            "rule": "S35",
            "reason": "Url link | cc21178aa0"
        }
    ]
}

[github-actions]

Note

[静态代码检查]

• 敏感词检查失败, 检测到1个文件存在敏感词

详情

{
    "CMakeLists.txt": [
        {
            "line": "  HOMEPAGE_URL \"https://github.com/linuxdeepin/qt5integration\"",
            "line_number": 15,
            "rule": "S35",
            "reason": "Url link | cc21178aa0"
        }
    ]
}

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: BLumia, hillwoodroc

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[github-actions]

Note

[静态代码检查]

• 敏感词检查失败, 检测到1个文件存在敏感词

详情

{
    "CMakeLists.txt": [
        {
            "line": "  HOMEPAGE_URL \"https://github.com/linuxdeepin/qt5integration\"",
            "line_number": 15,
            "rule": "S35",
            "reason": "Url link | cc21178aa0"
        }
    ]
}