cmake HAS_LIBAMCODEC examples

RasPlex/OpenPHT plex/CMakeModules/PlatformConfigAML.cmake :197

add_definitions(
  -DTARGET_LINUX
  -DHAS_GLES=2
  -DHAS_LIBAMCODEC
  -DHAS_BUILTIN_SYNC_ADD_AND_FETCH
  -DHAS_BUILTIN_SYNC_SUB_AND_FETCH
  -DHAS_BUILTIN_SYNC_VAL_COMPARE_AND_SWAP
)