[oe] git remote prune is needed on oe github mirror

[Phil Blundell]

On Fri, 2011-06-10 at 16:24 -0700, Khem Raj wrote:
> I see that oe-core when cloned from github still shows the 'maste'
> remote branch which has already been deleted in oe-core repo.
> 
> So we need to run 'git remote prune origin' periodically or somthing
> similar operation. It seems it does not get the removal information
> when the mirror is updated

Ah yes, well spotted.  Done.

p.