meson.build: Build even if gtk-layer-shell's version is too low.

Author: mtwebster

meson.build

@@ -138,9 +138,9 @@ conf.set('HAVE_SELINUX', libselinux_enabled)
 
 gtk_layer_shell_enabled = get_option('gtk_layer_shell')
 if gtk_layer_shell_enabled
-  gtk_layer_shell = dependency('gtk-layer-shell-0', version: '>=0.8')
+  gtk_layer_shell = dependency('gtk-layer-shell-0', version: '>=0.8', required: false)
 endif
-conf.set('HAVE_GTK_LAYER_SHELL', gtk_layer_shell_enabled)
+conf.set('HAVE_GTK_LAYER_SHELL', gtk_layer_shell.found())
 
 # make sure pango development files are installed
 pango = dependency('pango', version: '>=1.40.0')