[evince] comics: Sort pages in natural order

[Felipe Borges <felipeborges src gnome org>]

commit 3977c033b538a2a6a25214d1a4891b40dfebcae6
Author: Felipe Borges <felipeborges gnome org>
Date:   Fri Sep 9 16:57:00 2016 +0200

    comics: Sort pages in natural order
    
    Evince was sorting pages in lexicographic order. In doing so, often
    files named page1, page2, ..., page9, page10, ... to be sorted as
    page1, page10, ..., page2.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=770695

 backend/comics/comics-document.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/backend/comics/comics-document.c b/backend/comics/comics-document.c
index 845f517..3fbd632 100644
--- a/backend/comics/comics-document.c
+++ b/backend/comics/comics-document.c
@@ -20,6 +20,7 @@
 
 #include <config.h>
 
+#define _GNU_SOURCE
 #include <unistd.h>
 #include <string.h>
 #include <stdlib.h>
@@ -466,7 +467,7 @@ static int
 sort_page_names (gconstpointer a,
                  gconstpointer b)
 {
-  return strcmp (* (const char **) a, * (const char **) b);
+  return strverscmp (* (const char **) a, * (const char **) b);
 }
 
 static gboolean