ntdll: Implemented AmILastThread information class for NtQueryInformationThread.

server/protocol.def

diff --git a/server/protocol.def b/server/protocol.def
index 0d014dd..80a4af4 100644
--- a/server/protocol.def
+++ b/server/protocol.def
@@ -347,6 +347,7 @@
     int          affinity;      /* thread affinity mask */
     abs_time_t   creation_time; /* thread creation time */
     abs_time_t   exit_time;     /* thread exit time */
+    int          last;          /* last thread in process */
 @END