[mutter] build: Make minimum udev version as 228

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit b607d35aad27809a4885f4a9b6f02b7fdc0b4ed8
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Tue Nov 6 16:48:47 2018 -0200

    build: Make minimum udev version as 228
    
    Continuous' latest udev version is 228, and that is
    not going to change too soon. Since we do not depend
    on udev 232 specific features or bugfixes, just lower
    the minimum version and make Continouos happy.

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index e9fb865ab..edf7435e6 100644
--- a/meson.build
+++ b/meson.build
@@ -31,7 +31,7 @@ libwacom_req = '>= 0.13'
 atk_req = '>= 2.5.3'
 
 # optional version requirements
-udev_req = '>= 232'
+udev_req = '>= 228'
 
 # wayland version requirements
 wayland_server_req = '>= 1.13.0'