Arch Linux

Description:
When starting an application linking against qt5-mqtt (/usr/lib/libQt5Mqtt.so.5) the application crashes with the message:
Cannot mix incompatible Qt library (5.15.2) with this library (5.15.3)

Additional info:
* package version(s): qt5-mqtt-5.15.2-2 qt5-*-5.15.3+
* config and/or log files etc.
```
QCommandLineParser: already having an option named "h"
QCommandLineParser: already having an option named "help-all"
QCommandLineParser: already having an option named "v"
DEBUG debugging enabled
QDEBUG debugging enabled
AppDataLocation paths:
/home/tom/.local/share/labplot2
/usr/local/share/labplot2
/usr/share/labplot2
Icon theme search paths:
/home/tom/.local/share/icons
/usr/share/icons
:/icons
Library search paths:
/usr/lib/qt/plugins
/usr/bin
void MainWin::initGUI(const QString&), Component name: labplot2
void MainWin::initGUI(const QString&), XML file: labplot2ui.rc (should be "labplot2ui.rc")
dir: "/usr/lib/qt/plugins/cantor/backends"
Error while loading plugin: "cantor_luabackend.so"
dir: "/usr/bin/cantor/backends"
void GuiObserver::selectedAspectsChanged(QList<AbstractAspect*>&) const, type: 2000001
bool GuiObserverHelper::raiseDock(T*&, QStackedWidget*) [with T = ProjectDock], number of stacked widgets = 0
port ttyS4: /dev/ttyS4
kf.completion: KComboBox::setTrapReturnKey not supported with a non-KLineEdit.
ImportFileWidget::initOptionsWidget for Ascii
ImportFileWidget: reading available MQTT connections
ImportFileWidget::fileTypeChanged Ascii
ImportFileWidget::initOptionsWidget for Ascii
ImportFileWidget::fileNameChanged() :
ImportFileWidget::initOptionsWidget for Ascii
AsciiOptionsWidget::showAsciiHeaderOptions(1)
ImportFileDialog::checkOkButton()
Data Source Type: FileOrPipe
fileName =
ImportFileWidget::initOptionsWidget for Ascii
AsciiOptionsWidget::showAsciiHeaderOptions(0)
ImportFileDialog::checkOkButton()
Data Source Type: MQTT
Loading connections from "/home/user/.local/share/labplot2MQTT_connections"
Adding new connection
Cannot mix incompatible Qt library (5.15.2) with this library (5.15.3)
22 -- exe=/usr/bin/labplot2
13 -- platform=xcb
11 -- display=:0
17 -- appname=labplot2
17 -- apppath=/usr/bin
9 -- signal=6
10 -- pid=12240
17 -- appversion=2.8.2
20 -- programname=LabPlot
31 -- bugaddress=submit@bugs.kde.org
12 -- startupid=0
KCrash: crashing... crashRecursionCounter = 2
KCrash: Application Name = labplot2 path = /usr/bin pid = 12240
KCrash: Arguments: /usr/bin/labplot2
KCrash: Attempting to start /usr/lib/drkonqi
```

Steps to reproduce:
* Open /usr/bin/labplot2 from community/labplot
* Click `File -> New`
* Click `File -> Add New -> Live data source`
* Select `MQTT` as Source
* Click `Manage Connections`
* Click `Test`