[vdr] SourceCaps patch for VDR 1.3.31.

The attached patch allows a VDR system with multiple cards to attach each card to an individual dish pointing at a different satellite.

I have 3 DVB cards in my VDR system:

1) FF card connected to one output of LNB at a dish pointed at Astra 19.2E.

2) budget card connected to another output of LNB at a dish pointed at Astra 19.2E.

3) budget card connected to output of LNB at a dish pointed at Eutelsat 13.0E.

I am using the following entries for that in my setup.conf:

SourceCaps = 1 S19.2E SourceCaps = 2 S19.2E SourceCaps = 3 S13.0E