[crossfire] Fun issue :)

[Nicolas Weeger]

Hello.

I just fixed a fun issue: add_string() will abort() if sent string is NULL and 
MANY_CORES is defined. Except this define was never used, since the relevant 
file (config.h) wasn't included :)

Now the file is included, so the define has effect - and I had to fix the race 
for "dwarf_player" archetype, races file was still referring to old player 
dwarf_p (would cause an abort() in add_string!).

There was no warning as dwarf_p still exists, in arch/races/old. Maybe that 
directory should be cleaned? At least files renames to eg .arc.old so they 
don't get collected?

Nicolas
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