[vala-extra-vapis] Fixes get in libmemcached.vapi.

[Evan Nemerson <evann src gnome org>]

commit 0d1d9a8c6d45da8e7463bb810ea6e02c7372a73f
Author: Guillaume Poirier-Morency <guillaumepoiriermorency gmail com>
Date:   Sat Jul 4 23:40:43 2015 -0400

    Fixes get in libmemcached.vapi.
    
    NULL is returned when an error occur and 'size_t' has to be specified
    for the key size.

 libmemcached.vapi |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)
---
diff --git a/libmemcached.vapi b/libmemcached.vapi
index 83b4f3a..32b0e7a 100644
--- a/libmemcached.vapi
+++ b/libmemcached.vapi
@@ -85,8 +85,10 @@ namespace Memcached {
 
     // get.h
     [CCode (array_length_pos = 1.5, array_length_type = "size_t")]
-    public uint8[] get (uint8[] key, out uint32 flags, out Memcached.ReturnCode error);
+    public uint8[]? @get ([CCode (array_length_type = "size_t")] uint8[] key, out uint32 flags, out 
Memcached.ReturnCode error);
     public Memcached.ReturnCode mget ([CCode (array_length_type = "size_t", array_length_pos = 2.5)] 
uint8*[] keys, [CCode (array_length = false)] size_t[] keys_length);
+    [CCode (array_length_pos = 2.5, array_length_type = "size_t")]
+    public uint8[]? get_by_key ([CCode (array_length_type = "size_t")] uint8[] group_key, [CCode 
(array_length_type = "size_t")] uint8[] key, out uint32 flags, out Memcached.ReturnCode error);
 
     // server.h
     public Memcached.Instance server_by_key ([CCode (array_length_type = "size_t")] uint8[] key, out 
Memcached.ReturnCode error);