[lazarus] Patch for win32 : GetRelativePosition

[Marco van de Voort]

> and the memory usage grows quickly.
> 
> Do you know where i can find teorical documents about memory issues 
> (leaks) and pascal?

No, but compiling  OPT="-ghl" will print them with unit name and line number
if you are lucky, and can leave the application gracefully.

(if you are not, something in the rtl/fcl allocates them, and you would need
to recompile those too)