[gnome-games] developer: Add compare function

[Alexander Mikhaylenko <alexm src gnome org>]

commit 56a136d20d52097c34903890a0d35310872ae84f
Author: theawless <theawless gmail com>
Date:   Sun Aug 26 02:51:11 2018 +0530

    developer: Add compare function
    
    This will be used in subsequent commits for comparing developers.

 src/core/developer.vala | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/src/core/developer.vala b/src/core/developer.vala
index c9ac6ef9..a0507c17 100644
--- a/src/core/developer.vala
+++ b/src/core/developer.vala
@@ -12,4 +12,8 @@ public interface Games.Developer : Object {
        public static bool equal (Developer a, Developer b) {
                return str_equal (a.get_developer (), b.get_developer ());
        }
+
+       public static int compare (Developer a, Developer b) {
+               return strcmp (a.get_developer (), b.get_developer ());
+       }
 }