[mythtv] Prefix change to /usr rather than /usr/local?

[J. Donavan Stanley]

Martin Smith wrote:

>Guys,
>
>Did the prefix change to /usr in the mythtv settings.pro on purpose? It seems to
>have happened today.
>
>I kept getting errors about library version mismatches before I realised what
>was going on.
>
>  
>

Looks like it might have creeped in when mdz clarified the message for 
the IVTV define.  The compiler flags changed as well.