Do not sync to disk after each individual manual page (duh!),

only sync to disk one single time when all data is ready.

Rebuild times for /usr/share/man/mandoc.db shrink on my notebook:
In standard mode from 45 seconds to 11 seconds   (75% reduction)
In -Q mode       from 25 seconds to 3.1 seconds  (87% reduction)
For comparison: makewhatis(8):      4.2 seconds

That is, in -Q mode, we are now *faster* than the existing makewhatis(8),
and careful profiling shows there is still a lot of room for improval.

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