fix: cannot build on archlinux

[justforlxz]

remove Q_DECL_EXPORT, maybe Qt change default.

Log:

[deepin-ci-robot]

deepin pr auto review

关键摘要:

• 类定义中移除了 Q_DECL_EXPORT 宏，需要确认这是否是有意为之，因为这可能会影响动态链接库的导出行为。

是否建议立即修改:

• 是，如果移除 Q_DECL_EXPORT 是无意的，应该立即恢复，以避免潜在的链接问题。如果是有意为之，应该确保相关的文档和构建配置都已更新以反映这一变化。

[justforlxz]

https://gitlab.archlinux.org/archlinux/packaging/packages/qt6-base/-/blob/main/PKGBUILD?ref_type=heads#L117

archlinux enabled qt config -DFEATURE_no_direct_extern_access=ON, it will define QT_USE_PROTECTED_VISIBILITY macro in qconfig.h

qcompilerdetection.h will define Q_DECL_EXPORT protected, symbol will hidden.

#    ifdef QT_USE_PROTECTED_VISIBILITY
#      define Q_DECL_EXPORT     __attribute__((visibility("protected")))
#    else
#      define Q_DECL_EXPORT     __attribute__((visibility("default")))
#    endif

[deepin-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: justforlxz, tsic404

The full list of commands accepted by this bot can be found here.

Details

Needs approval from an approver in each of these files:

• debian/deepin/OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment