[evince] previewer: Fix build regression when gtk_unix_print is disabled

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

commit 4a94fad803f5041b44477f0a2933cb447d81d82f
Author: Chris Mayo <aklhfex gmail com>
Date:   Wed Apr 14 02:15:40 2021 +0000

    previewer: Fix build regression when gtk_unix_print is disabled
    
    Restore guard around ev_previewer_window_print because
    that function requires GTKUNIXPRINT_ENABLED, without the
    guard, makes the gtk_unix_print unusable.
    
    In the commit 65bfd21c ("previewer: Use GtkHeaderBar in print preview"), the GTKUNIXPRINT_ENABLED 
preprocessor guard around
    the usage of ev_previewer_window_print was lost.

 previewer/ev-previewer-window.c | 2 ++
 1 file changed, 2 insertions(+)
---
diff --git a/previewer/ev-previewer-window.c b/previewer/ev-previewer-window.c
index 6678aa75..7d3bd394 100644
--- a/previewer/ev-previewer-window.c
+++ b/previewer/ev-previewer-window.c
@@ -263,7 +263,9 @@ ev_previewer_window_print (GSimpleAction *action,
 #endif
 
 static const GActionEntry actions[] = {
+#if GTKUNIXPRINT_ENABLED
        { "print", ev_previewer_window_print },
+#endif
        { "go-previous-page", ev_previewer_window_previous_page },
        { "go-next-page", ev_previewer_window_next_page },
        { "select-page", ev_previewer_window_focus_page_selector },