Android T Preview 1
Use standards compliant header locations

Use signal.h instead of sys/signal.h and poll.h instead of sys/poll.h
to fix building against musl libc.

Bug: 190084016
Test: m USE_HOST_MUSL=true host-native
Change-Id: I41945f1b9414ceea7390f3eb5fbbac464f57c14e
2 files changed