vlc 2.0.3 ProjectM path fix

[Olli Hauer]

...
>> I think I got it: It is only a problem of configuring in the running 
>> vlc. You have to set the right path under 
>> 'Settings','All','Audio','Visualizing','projectM'. That's all ;-)
>>
> Aah-haah! :)  I've fixed the default paths and made a new patch:
> 
> 	http://people.freebsd.org/~nox/tmp/vlc-2.0.3-010.patch
> 


>From your patch:
> workaround is to deinstall the old vlc-1.x version before building 
> the new one. 

What about a conflict line ?
CONFLICTS_BUILD=${PORTNAME}-1.*

This allows users to fetch the source but they have to deinstall the
old version before building the new one.