FileSystemUtils: don't use bionic implementation details to align.

There are perfectly good clang builtins that we want to remove the bionic stuff in favor of.

Also, friends don't let friends print raw errno integers (which differ between architectures) when it's less code to print the actual error message.

Change-Id: I3e9664c60c06001e3185868b000c79a62effe991
1 file changed