utils: Avoid shadowing the names of global functions #661
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dirfd() and socket() are POSIX standard library functions, so use dfd and sockfd instead.
This fixes build failures with gcc 4.6 in an Ubuntu 12.04 derivative, but seems like a good cleanup change to make the code easier to understand, even if gcc no longer warns about this particular collision.
Unfortunately this is going to conflict with #659, although the conflict resolution is simple and obvious.
cc @refi64