Add missing function prototypes in time.h

Add clock_settime() and clock_nanosleep() function
prototypes in time.h.

Change-Id: I0eb45e465b3b48b9d4f3a4a8109a6f2d9c4f8ce2
Signed-off-by: Haruki Hasegawa <h6a.h4i.0@gmail.com>
Merge "Add missing function prototypes in time.h"
Rename android-L to android-21

Change-Id: I1e781b15a867cf6283756f35f2b5955c96637c39
Merge "Rename android-L to android-21"
Make memory_order_acquire visible in global namespace

We were missing that using directive when including <atomic>.

Bug:17736764

Change-Id: I93673dc60cca47195ff7bd651840c77255fb2d4a
Merge "Make memory_order_acquire visible in global namespace"