ntdll: Implement NtAllocateLocallyUniqueId with server call.
diff --git a/server/protocol.def b/server/protocol.def
index d88bbe8..f3175a3 100644
--- a/server/protocol.def
+++ b/server/protocol.def
@@ -203,6 +203,12 @@
     unsigned short attr;
 } char_info_t;
 
+typedef struct
+{
+    unsigned int low_part;
+    int          high_part;
+} luid_t;
+
 #define MAX_ACL_LEN 65535
 
 struct security_descriptor
@@ -2870,3 +2876,9 @@
 @REPLY
     int            impersonation_level; /* impersonation level of the impersonation token */
 @END
+
+/* Allocate a locally-unique identifier */
+@REQ(allocate_locally_unique_id)
+@REPLY
+    luid_t         luid;
+@END