- Don't require plasma5-workspace in plasma5-workspace-devel,
it pulls in a lot of unnecessary requirements and can cause
build loops

- Update to 5.12.4
* New bugfix release
* For more details please see:
* https://www.kde.org/announcements/plasma-5.12.4.php
- Changes since 5.12.3:
* [notifications applet] Fix two qml warnings about assigning [undefined]
* Remove long-time deprecated Encoding=UTF-8 from desktop format files
* [Run Command] Pass "event" to runCurrentIndex
* Move to KRunner's second results item with a single keypress (kde#392197)
* Pass proper click coordinates to SNI ContextMenu calls
* libdbusmenu-qt: Remove nonexistant actions directly from the menu
* Set a transient parent for SNI context menus
* [DeviceNotifications Engine] Never show safely remove message when mounting (kde#391180)
* Use dbus-run-session instead of dbus-launch --exit-with-session
* [System Tray] Fix hiding applets with HiddenStatus
* [Notifications] Remove NoAccessNetworkAccessManagerFactory
* Improve By Desktop sorting for task groups (kde#384747)
* Use separate config group for each wallpaper plugin
* Fix duplicated [Desktop Entry] sections in two menu directory files
- Remove patches, now upstream:
* 0001-Use-dbus-run-session-instead-of-dbus-launch-exit-wit.patch

- Add patches to not set QT_QPA_PLATFORM in a wayland session:
* 0001-Call-KLocalizedString-setApplicationDomain-after-Q-A.patch
* 0002-Add-platform-detection-to-KWorkspace-library-to-adju.patch
* 0003-No-longer-export-QT_QPA_PLATFORM-env-variable-to-the.patch