Move the upstream-netbsd libc files into the correct directory.

I screwed up when I originally imported these files; they're in lib/libc/
in the upstream tree; there is no top-level libc/ (though there is a top-level
common/, so those files stay where they are).

Change-Id: I7c5e2224a4441ab0e33616a855a8c6aacfeac46f
54 files changed