[evince] build: Bump gtk+ version to 3.22

[Germán Poo-Caamaño <gpoo src gnome org>]

commit 9f700da4bd989bbf7bd935c77a51ac514dd9c4a1
Author: Germán Poo-Caamaño <gpoo gnome org>
Date:   Mon Nov 5 17:18:44 2018 -0300

    build: Bump gtk+ version to 3.22
    
    * We started using 3.22 API on 3.30 (at least) to fix inconsistencies
      in our use of GtkPopover.
    * gspell requires at least 3.20, and we had set 3.16 before this change.

 configure.ac | 2 +-
 meson.build  | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/configure.ac b/configure.ac
index 9eeeb52f..9556e085 100644
--- a/configure.ac
+++ b/configure.ac
@@ -125,7 +125,7 @@ dnl Specify required versions of dependencies
 CAIRO_REQUIRED=1.10.0
 GLIB_REQUIRED=2.36.0
 LIBSECRET_REQUIRED=0.5
-GTK_REQUIRED=3.16.0
+GTK_REQUIRED=3.22.0
 NAUTILUS_REQUIRED=2.91.4
 GDK_PIXBUF_REQUIRED=2.36.5
 GSPELL_REQUIRED=1.6.0
diff --git a/meson.build b/meson.build
index 8423f232..f55d57ca 100644
--- a/meson.build
+++ b/meson.build
@@ -138,7 +138,7 @@ po_dir = join_paths(source_root, 'po')
 top_inc = include_directories('.')
 
 glib_req_version = '>= 2.36.0'
-gtk_req_version = '>= 3.16.0'
+gtk_req_version = '>= 3.22.0'
 
 gdk_pixbuf_dep = dependency('gdk-pixbuf-2.0', version: '>= 2.36.5')
 gio_dep = dependency('gio-2.0', version: glib_req_version)