How can I prevent/divert rain water from dripping on a flat flashing?
What you need is a set of gargoyles:


  Definition and Origin of Gargoyles and Grotesques
  Gargoyles came into gothic architecture in the early 13th century and are defined as "a waterspout, projecting from an upper part of a building or a roof gutter to throw water clear of walls or foundations." The origins of the word 'gargoyle' are derived from the old French word 'gargouille' meaning throat. 


A simple length of wire, extending down and outward from the point where the drop originates, should move the water clear of the brick and flashing.  A few inches should be enough.

More ornate structures

 

are optional