[gtk] Bump up the dependency on Meson

[Emmanuele Bassi <ebassi src gnome org>]

commit 99bcccd88404b356ec27f674fc04c1055e208250
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Sun Feb 11 16:42:09 2018 +0000

    Bump up the dependency on Meson
    
    We're going to use a new argument in the generate_gir() function.

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 3c7972d87a..8f5ad42f97 100644
--- a/meson.build
+++ b/meson.build
@@ -7,7 +7,7 @@ project('gtk+', 'c',
           # https://github.com/mesonbuild/meson/issues/2289
           'c_std=gnu99',
         ],
-        meson_version : '>= 0.42.1',
+        meson_version : '>= 0.43.0',
         license: 'LGPLv2.1+')
 
 glib_major_req = 2