CONFIG_LWIP_USE_ONLY_LWIP_SELECT was deprecated long time ago and removed (~ in v4.x).
Used CONFIG_VFS_SUPPORT_SELECT instead (and reverted the logic as this
is ON by default and needs to be explicitly turned off for socket only
select)
These files were added into the component directory back when we
didn't have the documentation directory, and weren't moved once the
documentation directory was created.