These don't work, aren't thread-safe, aren't in POSIX (or our header
files), and are only used by one app (whose developers I've contacted).
But the presence of these symbols causes configure to be confused, which
is a pain for Brillo.
Bug: http://b/24812426
Change-Id: I7fa6ef82864d5563929d9b8a7f8fcacb30b26d45