[PATCH v2] Huge performance boost for recursion (cp, du, find, ls, rm, mv)

[Jody Bruchon]

This revision reduces code size in concat_path_file_fast() by 19 bytes. It also applies the new get_d_namlen() optimization to a readdir() loop in runit/svlogd.c.

If there are any changes that need to be made for inclusion then please let me know as soon as possible. I'd like to finish this project up. If the old/slow and new/fast code should be chosen with a compile-time config option then I'm happy to do that as well.
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