[epiphany] sync-crypto: Use PRIu64 macro to print unsigned longs

[Gabriel Ivașcu <gabrielivascu src gnome org>]

commit 1bde93ab5f59a31b74d2378ff7c19b9b9c257613
Author: Gabriel Ivascu <gabrielivascu gnome org>
Date:   Mon Nov 6 09:55:34 2017 +0200

    sync-crypto: Use PRIu64 macro to print unsigned longs
    
    Prevent failure for platforms where longs are not 8 bytes.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=789656

 lib/sync/ephy-sync-crypto.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/lib/sync/ephy-sync-crypto.c b/lib/sync/ephy-sync-crypto.c
index e837aec..9b17c89 100644
--- a/lib/sync/ephy-sync-crypto.c
+++ b/lib/sync/ephy-sync-crypto.c
@@ -919,7 +919,7 @@ ephy_sync_crypto_create_assertion (const char           *certificate,
 
   /* Encode the header and body to base64 url safe and join them. */
   expires_at = g_get_real_time () / 1000 + seconds * 1000;
-  body = g_strdup_printf ("{\"exp\": %lu, \"aud\": \"%s\"}", expires_at, audience);
+  body = g_strdup_printf ("{\"exp\": %"PRIu64", \"aud\": \"%s\"}", expires_at, audience);
   body_b64 = ephy_sync_utils_base64_urlsafe_encode ((guint8 *)body, strlen (body), TRUE);
   header_b64 = ephy_sync_utils_base64_urlsafe_encode ((guint8 *)header, strlen (header), TRUE);
   to_sign = g_strdup_printf ("%s.%s", header_b64, body_b64);