Remove unused member variable m_imr in MBroadcastSocketDevice

The member variable m_imr appears to be a carryover
from a code copy/paste from the multicast socket
class (where it is used for the group address).
It is unused in a broadcast socket.  Remove it.

Fixes coverity 746874
Fixes #11622

NOTE: This modifies the binary ABI version number
      due to the mbroadcastsocket.h changes, so
      make distclean, etc. required.
(cherry picked from commit 5e15740)

Signed-off-by: Stuart Morgan <smorgan@mythtv.org>

mythtv/libs/libmythbase/mythversion.h

@@ -12,7 +12,7 @@
 /// Update this whenever the plug-in ABI changes.
 /// Including changes in the libmythbase, libmyth, libmythtv, libmythav* and
 /// libmythui class methods in exported headers.
-#define MYTH_BINARY_VERSION "0.27.20130624-1"
+#define MYTH_BINARY_VERSION "0.27.20130624-2"
 
 /** \brief Increment this whenever the MythTV network protocol changes.
  *

mythtv/libs/libmythupnp/mbroadcastsocketdevice.h

@@ -64,7 +64,6 @@ class MBroadcastSocketDevice : public MSocketDevice
   private:
     QHostAddress    m_address;
     quint16         m_port;
-    struct ip_mreq  m_imr;
 };
 
 #endif // _MBROADCAST_SOCKET_DEVICE_H_