nix-collect-garbage is slow on OS X because of lsof

[basvandijk]

nix-collect-garbage uses lsof on OS X to find all opened files by all processes in order to not collect opened files:

nix/src/libstore/gc.cc

Line 450 in 41a5246

tokenizeString<std::vector<string>>(runProgram(LSOF, true, { "-n", "-w", "-F", "n" }), "\n");

Unfortunately lsof is really slow on OS X. On my Macbook Pro lsof takes more than 6 seconds:

time lsof -n -w -F n > /dev/null
lsof -n -w -F n > /dev/null  0.24s user 6.01s system 99% cpu 6.252 total

This actually caused the gc-concurrent.sh test to fail because nix-collect-garbage takes longer to run than the nix build started earlier.

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