meson.build: Show gtk-layer-shell status in the build summary.

Author: mtwebster

meson.build

@@ -209,6 +209,7 @@ message('\n'.join(['',
 '    exempi  support:        @0@'.format(exempi_enabled),
 '    Tracker support:        @0@'.format(tracker_enabled),
 '    Wayland support:        @0@'.format(cc.has_header('gdk/gdkwayland.h', dependencies: gtk)),
+'      gtk-layer-shell-0:    @0@'.format(gtk_layer_shell_enabled and gtk_layer_shell.found()),
 '',
 '    nemo-extension documentation: @0@'.format(gtkdoc_enabled),
 '    nemo-extension introspection: @0@'.format(true),