[gtk+] build: Bump version and C standard

[Emmanuele Bassi <ebassi src gnome org>]

commit 47bcf66af8fa0f545b22c389fd712acb5d29f100
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Tue Apr 18 14:29:48 2017 +0100

    build: Bump version and C standard
    
    GTK+ 4.0 uses C99.

 meson.build |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/meson.build b/meson.build
index 36b8001..34ba0fb 100644
--- a/meson.build
+++ b/meson.build
@@ -1,8 +1,9 @@
 project('gtk+-4.0', 'c',
-        version: '3.89.50',
+        version: '3.91.1',
         default_options: [
           'buildtype=debugoptimized',
-          'warning_level=1'
+          'warning_level=1',
+          'c_std=c99',
         ],
         meson_version : '>= 0.39.1',
         license: 'LGPLv2.1+')