Function set_will_buy:
Defined in module m_vendor (file: /std/modules/m_vendor.c)

Set the array of object names which this living object is willing to buy.
set_will_buy(1) means it will buy anything.  set_will_buy(0) means it wont
by anything.  If a function is passed it will get the object to buy as
argument. If a single string is returned it will be used as error message.

Prototype:
void set_will_buy(mixed x);
