cmake build with qt6 (macos) does not include "plugins"

[pdv]

The merge branch killqt4 (commit 9376... on nov 28) broke the cmake 
install build on macos.

The "development/cmake/post_install/CMakeLists.txt' SCRIPT checks for 
qt5 and copies all plugins if different. This did work for qt4 but also 
for qt6.

The killqt4 branch removed this else part for qt4 but also for qt6.

The included patch restores this else clause and only the comment has 
been adapted (qt6 instead of qt4).

Since I don't know which plugins are actually needed I copied them all.

Regards,

P. De Visschere
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diff --git a/development/cmake/post_install/CMakeLists.txt b/development/cmake/post_install/CMakeLists.txt
index 52a2f782af..dbd210d412 100644
--- a/development/cmake/post_install/CMakeLists.txt
+++ b/development/cmake/post_install/CMakeLists.txt
@@ -36,6 +36,10 @@ if(LYX_BUNDLE)
        		endif()
         install_qt_plugin("Qt5::QCocoaIntegrationPlugin")
        endif()
+    else()
+        # With QT6, just copy all the plugins
+        file(GLOB QT_PLUGIN_DIRECTORIES "${QT_PLUGINS_DIR}/*")
+        install(DIRECTORY ${QT_PLUGIN_DIRECTORIES} DESTINATION "${qtplugin_dest_dir}/plugins/" COMPONENT Runtime)
     endif()
 
     # Install code does the following: