[vte/vte-0-68: 1/4] build: Assert on non-supported option on stable branch

[Christian Persch <chpe src gnome org>]

commit 62da45c67465fe94fd962788729020738292b15f
Author: Christian Persch <chpe src gnome org>
Date:   Fri Feb 11 19:01:03 2022 +0100

    build: Assert on non-supported option on stable branch
    
    (cherry picked from commit 1e38c581b8cc45be46e0bb1f2fec2df50712bb3b)

 meson.build | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/meson.build b/meson.build
index 381d5d58..6c353105 100644
--- a/meson.build
+++ b/meson.build
@@ -192,6 +192,8 @@ if get_option('gtk3')
 endif
 
 if get_option('gtk4')
+  assert(false, 'gtk4 is not supported on this branch; use git master')
+
   gtk4_version_cppflags = []
 
   ver = gtk4_min_req_version.split('.')