[rhythmbox/wip/sam/meson] Set minimum Meson version

[Sam Thursfield <sthursfield src gnome org>]

commit e51a3291f75c72b1aeeaf399ce997668f9d2d35c
Author: Sam Thursfield <sam afuera me uk>
Date:   Thu Oct 29 12:01:51 2020 +0100

    Set minimum Meson version
    
    We need 0.49 at least for the `/` path join operator.

 meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/meson.build b/meson.build
index 7112632a9..e15dbb7a4 100644
--- a/meson.build
+++ b/meson.build
@@ -2,6 +2,7 @@
 
 project('rhythmbox', 'c',
   version: '3.4.4',
+  meson_version: '>= 0.50.0',
   default_options: ['c_std=gnu89'])
 
 gnome = import('gnome')