[oe] Avoiding registration as shlib provider

[Carlos Rafael Giani]

Hello,

I have noticed the problem with GStreamer in current master: the many 
"xyz was registered as shlib provider" warnings.
Actually, it makes no sense to register the plugins, since they are, 
well, plugins. No other package must have a hard dependency on any of 
them. So, it would make sense to disable registration for the plugins. 
Is this possible?

cheers