liblog: add unistd.h to vndk log/log.h

Too many vendors assume that this is included, and it's not worth the
effort to clean up.

Bug: 165825252
Test: build
Change-Id: I42fb32be7e5e3201dfc5c58734e3ef5b9251faf1
1 file changed
tree: 955812089448b0df01df9dcaf99419b2bdf49bc1
  1. liblog/
  2. logcat/
  3. logd/
  4. logwrapper/