ports/126853: ports-mgmt/portaudit: speed up audit of installed packages

[Eygene Ryabinkin]

Gentlemen, good day.

Just a reminder about this PR -- it is already a bit old.  But it is
still viable and kicking on many machines of mine.  I am seeing speedups
from 10x to 26x comparing to the plain portaudit.  Since VuXML database
will only grow, this will be good to consider these patches and (likely)
integrate them into main trees.

Could someone, please, look at the patches?  I had uploaded slightly
modified patches to the old locations.  Most of changes were cosmetic:
whitespace and so on.  No real code was changed.

In the case of suggestions, bugs, etc -- I am all ears.  Thanks!
-- 
Eygene
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