QTestLib: Remove logging category declaration from public header

The lcQtGuiTest category is only used in qtestsupport_gui.cpp, so
declare it there as a static logging category.

Addresses header-review comment, amends
5ac4f04.

Pick-to: 6.9
Task-number: QTBUG-132090
Change-Id: I5b2a93822a698f55c52c1be87ebf8a689f49e2a3
Reviewed-by: Axel Spoerl <axel.spoerl@qt.io>
Reviewed-by: Juha Vuolle <juha.vuolle@qt.io>

src/gui/kernel/qtestsupport_gui.cpp

@@ -14,6 +14,7 @@
 #include <QtCore/QDebug>
 
 #if QT_CONFIG(test_gui)
+#include <QtCore/qloggingcategory.h>
 #include <private/qinputdevicemanager_p.h>
 #include <private/qeventpoint_p.h>
 #include <private/qhighdpiscaling_p.h>
@@ -183,7 +184,7 @@ QEventPoint &QTouchEventSequence::pointOrPreviousPoint(int touchId)
 // We mean it.
 //
 #if QT_CONFIG(test_gui)
-Q_LOGGING_CATEGORY(lcQtGuiTest, "qt.gui.test");
+Q_STATIC_LOGGING_CATEGORY(lcQtGuiTest, "qt.gui.test");
 #define deb qCDebug(lcQtGuiTest)
 
 /*!

src/gui/kernel/qtestsupport_gui.h

@@ -8,10 +8,6 @@
 #include <QtGui/qevent.h>
 #include <QtCore/qmap.h>
 
-#if QT_CONFIG(test_gui)
-#include <QtCore/qloggingcategory.h>
-#endif // #if QT_CONFIG(test_gui)
-
 QT_BEGIN_NAMESPACE
 
 class QWindow;
@@ -75,7 +71,6 @@ class Q_GUI_EXPORT QTouchEventSequence
 //
 
 #if QT_CONFIG(test_gui)
-Q_DECLARE_LOGGING_CATEGORY(lcQtGuiTest)
 namespace QtGuiTest
 {
     Q_NAMESPACE_EXPORT(Q_GUI_EXPORT)