meson cleanup

src/meson.build

@@ -28,8 +28,6 @@ picplanner_deps = [
   meson.get_compiler('c').find_library('m', required: false),
 ]
 
-add_global_arguments('-Dlibsoup3=true', language : 'c')
-
 gnome = import('gnome')
 
 picplanner_sources += gnome.compile_resources('picplanner-resources',