Sync CMake build with the configure build.
Sync CMake build with the configure build.

Added: CONFIG_INSTALL_DOCS, CONFIG_ALTREF2, CONFIG_FLEX_REFS
       CONFIG_LPF_DIRECT.
Changed, 0 => 1: CONFIG_RECT_INTRA_PRED

Change-Id: I1e958ab7dcd0c791b33a0ac5104fdf557f2cd29c

GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom,GrokImageCompression/aom