[vdr] streamdev-cvs bugs & fixes

Hi,

upon testing of softdevice-cvs in combination with streamdev-cvs I got the the following errors which could be fixed by attached diffs.

error: undefined symbol: _ZN16cMenuWhatsOnItemC1EPK6cEventP8cChannelb fix: streamdev-cvs-client.diff + streamdev-cvs-Makefile.diff

error: streamdev-cvs server "pure virtual method called" fix: streamdev-cvs-server.diff

pending bug: server does not switch channel upon client request. only channels from current (server side) transponder could be selected.

test enviroment: vdr-1.3.22 (unpatched, vanilla), softdevice-cvs (from today, xv-out)