Sync CMake build defaults with the configure build.

- Added: CONFIG_ONE_SIDED_COMPOUND CONFIG_VAR_REFS
- Removed: CONFIG_SUB8X8_MC CONFIG_EC_MULTISYMBOL
           CONFIG_DAALA_EC CONFIG_LOWDELAY_COMPOUND
- Changed, 0 => 1: CONFIG_VAR_TX CONFIG_EC_SMALLMUL
                   CONFIG_CHROMA_SUB8X8
                   CONFIG_LOOPFILTERING_ACROSS_TILES
                   CONFIG_TEMPMV_SIGNALING

BUG=aomedia:76

Change-Id: Ia010abeaf079d8c6318a5a540e9354d5455ce826