Fix building parameter-framework against musl

Use the standards compliant poll.h instead of sys/poll.h

Use posix strerror_r for musl, it doesn't have the GNU version.

Bug: 190084016
Test: m USE_HOST_MUSL=true host-native
Change-Id: I144e8303acb6243a51cbe93b6a9b7785ccb07417
2 files changed