https://bugs.gentoo.org/865363

From 109d7bbec01870f8e944a9cde09d3e2f70e13e0d Mon Sep 17 00:00:00 2001
From: Bernd Waibel <waebbl-gentoo@posteo.net>
Date: Mon, 22 Aug 2022 07:10:35 +0200
Subject: [PATCH] fix designer plugin install location

Signed-off-by: Bernd Waibel <waebbl-gentoo@posteo.net>
--- a/plugins/designer/CMakeLists.txt
+++ b/plugins/designer/CMakeLists.txt
@@ -53,4 +53,4 @@ target_link_libraries(PySidePlugin PRIVATE
                       Qt::Widgets
                       ${SHIBOKEN_PYTHON_LIBRARIES})
 
-install(TARGETS PySidePlugin LIBRARY DESTINATION "plugins/designer")
+install(TARGETS PySidePlugin LIBRARY DESTINATION "lib${LIB_SUFFIX}/qt6/plugins/designer")