[Toybox] [PATCH] Fix cp -P to not follow symlinks.

[enh]

Also fix help text to say that it is not the default.

[this patch originally uploaded by mast at
https://android-review.googlesource.com/c/platform/external/toybox/+/1406088;
if i'd realized i could get a patch text file in one click directly from
gerrit, i'd have forwarded this last night before bed. TIL!]
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