[gtksourceview] build: fix min/max GTK version check

[Christian Hergert <chergert src gnome org>]

commit 79a6fd67f511eba0da462e74d80c45207e3f23ac
Author: Christian Hergert <chergert redhat com>
Date:   Fri Apr 9 08:20:26 2021 -0700

    build: fix min/max GTK version check
    
    We dependend on 4.1 GTK (developement branch) for our release, but 4.2
    (stable) is out now. Mark that as our dependency and ensure that we set
    the flags for deprecation and availability tracking.

 meson.build | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)
---
diff --git a/meson.build b/meson.build
index 0cb4bf8c..9e712957 100644
--- a/meson.build
+++ b/meson.build
@@ -68,7 +68,7 @@ build_gtk_doc = get_option('gtk_doc')
 cc = meson.get_compiler('c')
 
 glib_req_version = '2.66'
-gtk_req_version = '4.1'
+gtk_req_version = '4.2'
 
 libm_dep = cc.find_library('m', required: false)
 
@@ -118,10 +118,9 @@ glib_version_arr = glib_req_version.split('.')
 glib_major_version = glib_version_arr[0]
 glib_minor_version = glib_version_arr[1]
 
-# XXX: Override until GTK 4 is released
 gtk_version_arr = gtk_req_version.split('.')
-gtk_major_version = '4' # gtk_version_arr[0]
-gtk_minor_version = '0' # gtk_version_arr[1]
+gtk_major_version = gtk_version_arr[0]
+gtk_minor_version = gtk_version_arr[1]
 
 # Configurations
 add_project_arguments([