Merge "Include sys/types.h for pid_t" am: fd31e824ed am: 01368bb2fb

Original change: https://android-review.googlesource.com/c/platform/system/extras/+/2380776

Change-Id: Ia58288abe9393897d149b31ebc25718c707b4ba5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>