Gprof(1) is fun. You should use it more often.

Gprof(1) is fun.  You should use it more often.

Another 10% speedup for mandocdb(8) -Q, and even 3% without -Q.
With -Q, we are now at 41% of the time required by makewhatis(8).

Do not copy predefined strings into the dynamic string table, just
leave them in their own static table and use that one as a fallback
at lookup time.  This saves us copying and deleting them for each manual.
No functional change.