Make the man(1) and apropos(1) options -s and -S much less expensive:

Do not append an SQL clause looking into the large "keys" table.
Instead, filter the result of the SQL query in buildnames() where
equivalent data from the much smaller "mlinks" table is already
available for free.

This is relevant because man(1) uses the equivalent of "-S ${MACHINE}"
by default since main.c rev. 1.122, to make sure that manuals for
the current architecture are shown.  With many ports installed, this
patch can speed up man(1) by a factor of more than a hundred.

Slowness reported by Theo Buehler <theo at math dot ethz dot ch>, thanks!

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