[gtk: 3/6] meson: Make vulkan and xinerama optional deps default to 'auto'

[Matthias Clasen <matthiasc src gnome org>]

commit ea3933b87a4e82dc6f6b9b4fbd434b0294b7562e
Author: Xavier Claessens <xavier claessens collabora com>
Date:   Fri Oct 16 17:57:48 2020 -0400

    meson: Make vulkan and xinerama optional deps default to 'auto'
    
    It is nicer for contributors to have a build that works by default.
    Distributors should be using -Dauto_features=enabled to get ride of
    automagic options.

 meson_options.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/meson_options.txt b/meson_options.txt
index b58c8a9fa0..ac50721ff8 100644
--- a/meson_options.txt
+++ b/meson_options.txt
@@ -43,12 +43,12 @@ option('print',
 
 option('vulkan',
        type: 'feature',
-       value: 'enabled',
+       value: 'auto',
        description : 'Enable support for the Vulkan graphics API')
 
 option('xinerama',
        type: 'feature',
-       value: 'enabled',
+       value: 'auto',
        description : 'Enable support for the X11 Xinerama extension')
 
 option('cloudproviders',