[x265] source/common/intrapred.cpp -- C version of angular intra performs double transpose

[Matt Johnson]

Hi all,
	It looks like the allangs C variant of angular intra prediction 
transposes the predicted pixel matrix twice; the intra_pred_ang_c() 
function, which does a single mode prediction, transposes the predicted 
pixel matrix if necessary, then the wrapper all_angs_pred_c() transposes 
it again.  It seems like the all_angs_pred_c() transpose should be removed.

	As a side note, should the planad_pred_c() templated function be 
renamed planar_pred_c()?

Thanks,
Matt