mix.c - A very basic mixer.
New toys unified DIFF and USERDEL.
Unbreak find -exec.
Add --help support to single.sh builds.
Yank xrealpath prototype since the function's gone.
Cosmetic tweak, slightly more conventional for loop.
Missed checking in dirtree_recurse() change (now needs specific DIRTREE_SYMFOLLOW value, not just true/false).
Squash mix of tabs and spaces to just spaces.