[Bug 229773] sysutils/dupd: update to version 1.7

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=229773

--- Comment #6 from Thomas Hurst <tom at hur.st> ---
-O2 is default, O3's quite aggressive and can break stuff, hence limiting it to
specific ports which benefit from it by default, and letting more conservative
users opt out.

Some quick testing with a mix of stuff shows quite modest differences between
O2 and O3, between less than nothing and 15%, and it's reflected more by
consumed CPU time than actual runtime.  Maybe it's more pronounced on newer
systems (this is an old Westmere with wonky memory) or on gcc?

(I did notice it eating ~6GB on my CVS tree with a million small files,
contrasting with jdupes that peaked at about 220MB - seems a bit excessive?)

Regarding PREFIX, fair point.  You are doing INC+= and LIB+=, so I can just
pass those in myself and it won't blat them, so you can probably just leave
that.

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