Fixes Icon Issue on Neko Cross Compile Linux to Windows, fix openfl/lime#626
Fixes Icon Issue on Neko Cross Compile Linux to Windows, fix openfl/lime#626

During Cross-Compile from Linux to Windows, Neko Compilation chain will normally call into ReplaceVistaIcon.exe, unfortunately, EXE files are not native applications of NON-Windows systems, thus a permission issue occurs.

By indicating to the Source Code that ReplaceVistaIcon.exe be called only when it detected Windows systems through 

    PlatformHelper.hostPlatform == Platform.WINDOWS

The issue is fixed.
openfl/lime,MinoGames/lime,madrazo/lime-1,madrazo/lime-1,openfl/lime,openfl/lime,player-03/lime,madrazo/lime-1,madrazo/lime-1,player-03/lime,player-03/lime,player-03/lime,MinoGames/lime,MinoGames/lime,MinoGames/lime,openfl/lime,fbricker/lime,fbricker/lime,madrazo/lime-1,MinoGames/lime,player-03/lime,player-03/lime,madrazo/lime-1,fbricker/lime,player-03/lime,MinoGames/lime,openfl/lime,openfl/lime,madrazo/lime-1,MinoGames/lime,openfl/lime,fbricker/lime,fbricker/lime,fbricker/lime,fbricker/lime