M302de: BC: borlandify some seg039 functions
M302de: BC: add macro for close()
M302de: BC: make seg105 and seg106 compile with BC
M302de: add item_armor() helper
M302de: BC: rework pointer inc/dec
M302de: BC: SEG047 change from inc/dec to add/sub
M302de: BC: borlandify two_hand_collision()
M302de: Bugfix: has_hero_equipped()

This function checks if a hero has equipped an item,
which id is given as an argument.
M302de: Bugfix: equipping the Death-Head Belt, wrong Malus
M302de: BC: Borlandify some seg105 functions