MAINTAINERS: Add status to icecast

Last icecast threads have Marvin in them so it seems maintained

CC: Marvin Scholz <epirat07@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

MAINTAINERS

@@ -486,7 +486,7 @@ Protocols:
   libzmq.c                              Andriy Gelman
   mms*.c                                Ronald S. Bultje
   udp.c                                 Luca Abeni
-  icecast.c                             Marvin Scholz (CC <epirat07@gmail.com>)
+  icecast.c                         [2] Marvin Scholz (CC <epirat07@gmail.com>)
 
 
 libswresample