qt5-styleplugins: rebuild against qt 5.15.4

srcpkgs/qt5-styleplugins/patches/qt5.15.patch

@@ -8,8 +8,8 @@
            QApplication::setPalette(newPalette);
            if (!QGtkStylePrivate::instances.isEmpty()) {
                QGtkStylePrivate::instances.last()->initGtkWidgets();
---- a/src/plugins/styles/gtk2/qgtkstyle.cpp	2020-06-13 19:48:41.746108796 +0200
-+++ b/src/plugins/styles/gtk2/qgtkstyle.cpp	2020-06-13 19:48:41.746108796 +0200
+--- a/src/plugins/styles/gtk2/qgtkstyle.cpp	2017-03-11 10:23:02.000000000 +0100
++++ -	2022-06-17 16:59:37.087644652 +0200
 @@ -440,7 +440,7 @@
      // not supported as these should be entirely determined by
      // current Gtk settings

srcpkgs/qt5-styleplugins/template

@@ -1,7 +1,7 @@
 # Template file for 'qt5-styleplugins'
 pkgname=qt5-styleplugins
 version=5.0.0
-revision=16
+revision=17
 _gitrev=335dbece103e2cbf6c7cf819ab6672c2956b17b3
 wrksrc="qtstyleplugins-${_gitrev}"
 build_style=qmake