[gtk] Revert "Bump meson req to 0.50"

[Benjamin Otte <otte src gnome org>]

commit 1944ffe35121a406b6ea0bb1f37d7925cb406f62
Author: Benjamin Otte <otte redhat com>
Date:   Fri Mar 29 10:19:41 2019 +0100

    Revert "Bump meson req to 0.50"
    
    This reverts commit f0845d98a21a7a5c5817d50f2076dd2615e3979b.
    
    The commit breaks CI. CI has more power than meson telling things.

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index 4d6201b50c..15af29178c 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 : '>= 0.50.0',
+        meson_version : '>= 0.48.0',
         license: 'LGPLv2.1+')
 
 glib_major_req = 2