QGenericUnixTheme: Fix build, adding missing #includes

qdbuslistener.cpp:105:5: error: ‘QJsonParseError’ was not declared in this scope
qgenericunixtheme.cpp:247:21: error: invalid use of incomplete type ‘class QDBusConnectionInterface’
qkdetheme.cpp:91:109: error: ‘QSettings’ was not declared in this scope; did you mean ‘QString’?
qkdetheme.cpp:712:30: error: ‘QStandardPaths’ has not been declared

Probably amends 53fb13456fffe8bfd192f9197c6d1703854b49a2.

Change-Id: I673a2fa3f34c162d4d76fffdf160ed8a7af1fc66
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>

src/gui/platform/unix/qdbuslistener.cpp

@@ -6,6 +6,9 @@
 #include <qpa/qplatformintegration.h>
 #include <qpa/qplatformservices.h>
 #include <private/qdbustrayicon_p.h>
+#include <qjsonarray.h>
+#include <qjsondocument.h>
+#include <qjsonobject.h>
 
 QT_BEGIN_NAMESPACE
 using namespace Qt::StringLiterals;

src/gui/platform/unix/qgenericunixtheme.cpp

@@ -48,6 +48,7 @@
 #include <qpa/qplatformintegration.h>
 #include <QtCore/QStandardPaths>
 #ifndef QT_NO_DBUS
+#include <QtDBus/QDBusConnectionInterface>
 #include <private/qdbustrayicon_p.h>
 #endif
 #if QT_CONFIG(mimetype)

src/gui/platform/unix/qkdetheme.cpp

@@ -11,6 +11,8 @@
 #include <private/qdbustrayicon_p.h>
 #include <private/qdbusplatformmenu_p.h>
 #include <private/qdbusmenubar_p.h>
+#include <QSettings>
+#include <QStandardPaths>
 
 QT_BEGIN_NAMESPACE