Remove reference to compatibility layer
Remove reference to compatibility layer

The compatibility layer was removed before the 1.4.0 release.

Change-Id: I268513ee9b3a2640ec33c4a25a5c5614fee7b3b2

mbebenita/aom,VTCSecureLLC/libvpx,felipebetancur/libvpx,thdav/aom,liqianggao/libvpx,openpeer/libvpx_new,GrokImageCompression/aom,webmproject/libvpx,openpeer/libvpx_new,luctrudeau/aom,openpeer/libvpx_new,ShiftMediaProject/libvpx,ittiamvpx/libvpx-1,GrokImageCompression/aom,mbebenita/aom,running770/libvpx,zofuthan/libvpx,webmproject/libvpx,felipebetancur/libvpx,ittiamvpx/libvpx-1,liqianggao/libvpx,running770/libvpx,mwgoldsmith/libvpx,stewnorriss/libvpx,thdav/aom,VTCSecureLLC/libvpx,stewnorriss/libvpx,jmvalin/aom,VTCSecureLLC/libvpx,smarter/aom,running770/libvpx,mwgoldsmith/vpx,ittiamvpx/libvpx-1,ittiamvpx/libvpx-1,luctrudeau/aom,thdav/aom,ShiftMediaProject/libvpx,mwgoldsmith/libvpx,running770/libvpx,zofuthan/libvpx,shyamalschandra/libvpx,mbebenita/aom,mwgoldsmith/libvpx,ShiftMediaProject/libvpx,thdav/aom,stewnorriss/libvpx,shyamalschandra/libvpx,GrokImageCompression/aom,mbebenita/aom,stewnorriss/libvpx,shacklettbp/aom,liqianggao/libvpx,zofuthan/libvpx,webmproject/libvpx,running770/libvpx,zofuthan/libvpx,Topopiccione/libvpx,ittiamvpx/libvpx-1,goodleixiao/vpx,felipebetancur/libvpx,mbebenita/aom,luctrudeau/aom,mwgoldsmith/vpx,webmproject/libvpx,thdav/aom,mwgoldsmith/libvpx,smarter/aom,felipebetancur/libvpx,VTCSecureLLC/libvpx,webmproject/libvpx,felipebetancur/libvpx,running770/libvpx,mwgoldsmith/vpx,jmvalin/aom,luctrudeau/aom,smarter/aom,mwgoldsmith/vpx,jmvalin/aom,Topopiccione/libvpx,ShiftMediaProject/libvpx,mwgoldsmith/libvpx,GrokImageCompression/aom,zofuthan/libvpx,zofuthan/libvpx,VTCSecureLLC/libvpx,shyamalschandra/libvpx,Topopiccione/libvpx,shacklettbp/aom,openpeer/libvpx_new,goodleixiao/vpx,shacklettbp/aom,jmvalin/aom,luctrudeau/aom,smarter/aom,goodleixiao/vpx,liqianggao/libvpx,mbebenita/aom,Topopiccione/libvpx,liqianggao/libvpx,shacklettbp/aom,thdav/aom,openpeer/libvpx_new,GrokImageCompression/aom,openpeer/libvpx_new,webmproject/libvpx,mbebenita/aom,felipebetancur/libvpx,mwgoldsmith/vpx,smarter/aom,ShiftMediaProject/libvpx,goodleixiao/vpx,liqianggao/libvpx,mwgoldsmith/libvpx,luctrudeau/aom,VTCSecureLLC/libvpx,stewnorriss/libvpx,goodleixiao/vpx,GrokImageCompression/aom,shyamalschandra/libvpx,mbebenita/aom,Topopiccione/libvpx,shyamalschandra/libvpx,smarter/aom,jmvalin/aom,stewnorriss/libvpx,goodleixiao/vpx,shacklettbp/aom,mbebenita/aom,mwgoldsmith/vpx,jmvalin/aom,shacklettbp/aom,shyamalschandra/libvpx,ittiamvpx/libvpx-1,Topopiccione/libvpx