cmdline, wayland: set environment variables needed to start qt gui apps

Adapts /etc/profile to set XDG_RUNTIME_DIR, QT_QPA_PLUGIN, QT_QPA_FONTDIR
and QT_WAYLAND_DISABLE_WINDOWDECORATION

BCS 746-000082

recipes-core/base-files/base-files/profile

@@ -34,3 +34,5 @@ umask 022
 # Defaults to allow start of gui tools from the commandline
 export XDG_RUNTIME_DIR=/run/user/0
 export QT_QPA_FONTDIR=/usr/share/fonts/truetype
+export QT_QPA_PLATFORM=wayland-egl
+export QT_WAYLAND_DISABLE_WINDOWDECORATION=1