[x265] patches for fast-intra

[dave]

I have submitted patches for two versions of the fast intra search. The 
first uses the faster search by calling intra_pred and satd to calculate 
cost.  The second calls intra_pred_allangs then uses the faster search 
with satd.  In my testing both were slightly faster with the all-angs 
version not as fast as the other most of the time but not always.  I 
submitted both hoping that someone else has better testing methods that 
might better distinguish between them.

Dave