xvmc: add missing dependency on Xv
libXvMC does not directly pull in libXv since dd9ae03 (1.0.12 onwards). Add the missing Xv depenedency as the driver does need libXv.
Closes #180
Due to an influx of spam, we have had to impose restrictions on new accounts. Please see this wiki page for instructions on how to get full permissions. Sorry for the inconvenience.
libXvMC does not directly pull in libXv since dd9ae03 (1.0.12 onwards). Add the missing Xv depenedency as the driver does need libXv.
Closes #180