[gtk/ebassi/issue-3486] build: Put back the list of print backends in config.h

[Emmanuele Bassi <ebassi src gnome org>]

commit f3ccb3a5f42b38a4d3e5628234eda077464aecff
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Mon Dec 21 19:09:24 2020 +0000

    build: Put back the list of print backends in config.h
    
    The GTK_PRINT_BACKENDS symbol was dumped too early into the
    configuration data object, and was missing all enabled print backends.
    
    Fixes: #3486

 modules/printbackends/meson.build | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)
---
diff --git a/modules/printbackends/meson.build b/modules/printbackends/meson.build
index 0d5bcf2c76..c4dd8f86bb 100644
--- a/modules/printbackends/meson.build
+++ b/modules/printbackends/meson.build
@@ -16,8 +16,6 @@ endif
 printbackends_subdir = 'gtk-4.0/@0@/printbackends'.format(gtk_binary_version)
 printbackends_install_dir = join_paths(get_option('libdir'), printbackends_subdir)
 
-cdata.set_quoted('GTK_PRINT_BACKENDS', ','.join(print_backends))
-
 printbackends_args = [
   '-DGTK_COMPILATION',
   '-DGTK_DISABLE_DEPRECATION_WARNINGS',
@@ -77,3 +75,6 @@ shared_module('printbackend-file',
   install_dir: printbackends_install_dir,
   install: true,
 )
+
+# Store the print backends in the config.h
+cdata.set_quoted('GTK_PRINT_BACKENDS', ','.join(print_backends))