[evolution] Use a secure URL for queries from gravatar.com

[Milan Crha <mcrha src gnome org>]

commit 7d28bdf277a4dbda9bb3a99505b496f466c41905
Author: Milan Crha <mcrha redhat com>
Date:   Mon Feb 23 10:03:36 2015 +0100

    Use a secure URL for queries from gravatar.com
    
    As suggested in bug #730743 comment #6

 modules/gravatar/e-gravatar-photo-source.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/modules/gravatar/e-gravatar-photo-source.c b/modules/gravatar/e-gravatar-photo-source.c
index a1afa5e..e401a61 100644
--- a/modules/gravatar/e-gravatar-photo-source.c
+++ b/modules/gravatar/e-gravatar-photo-source.c
@@ -24,7 +24,7 @@
        (G_TYPE_INSTANCE_GET_PRIVATE \
        ((obj), E_TYPE_GRAVATAR_PHOTO_SOURCE, EGravatarPhotoSourcePrivate))
 
-#define AVATAR_BASE_URI "http://www.gravatar.com/avatar/";
+#define AVATAR_BASE_URI "https://secure.gravatar.com/avatar/";
 
 struct _EGravatarPhotoSourcePrivate
 {