Synopsys   : FILTER_GENDER(x, g)

Defined in : /sys/filter_funs.h

Description: This filter returns an array with only those objects that are
             of the requested gender. If there are objects in the array that
             are player nor NPC, they will be considered male.
Arguments  : object *x - the array with objects to filter.
             int g     - the gender to filter for. Use a definition in
                         <const.h>
Returns    : object *  - an array with only objects of gender 'g' in it.
