FIX: make the user callbacks definition Windows-specific mandatory presence only when compiling for Windows platform.
FIX: make the user callbacks definition Windows-specific mandatory presence only when compiling for Windows platform.

vehar/red,rheber/red,vehar/red,rheber/red,NikolayShubenkovProgSchool/red,iArnold/red,NikolayShubenkovProgSchool/red,red-eco/red,red-eco/red,iArnold/red