[vte] build: Remove gtk4 notice

[Christian Persch <chpe src gnome org>]

commit 20d83ba052c94c0030f2964e1cbad7b012af81a2
Author: Christian Persch <chpe src gnome org>
Date:   Fri Aug 5 21:11:18 2022 +0200

    build: Remove gtk4 notice
    
    While not completely stable yet, it's no longer experimental.

 meson.build | 4 ----
 1 file changed, 4 deletions(-)
---
diff --git a/meson.build b/meson.build
index 70455b02..5f2fed65 100644
--- a/meson.build
+++ b/meson.build
@@ -731,8 +731,4 @@ output += '\n'
 output += '  Prefix:       ' + get_option('prefix') + '\n'
 message(output)
 
-if get_option('gtk4')
-  warning('GTK+ 4.0 support is experimental; API and ABI are subject to change without notice\n')
-endif
-
 # Done