[Cin] AOM 3.8, again

I have compiled with both aom 3.8 and aom 3.6 patches without errors. The rendering test results are: aom 3.4: 34 fps aom 3.6: 39 fps aom 3.8: 48 fps The speed increase is noticeable. The videos result visually of the same quality. aom 3.4 and 3.6 give files of equal size while aom 3.8 gives a slightly smaller file.