Replace MSVC __debugbreak with cross-compiler DEBUG_BREAK macro. (#1540)

Minecraft.World/BiomeDecorator.cpp

@@ -23,7 +23,7 @@ void BiomeDecorator::decorate(Level *level, Random *random, int xo, int zo)
 	{
 		app.DebugPrintf("BiomeDecorator::decorate - Already decorating!!\n");
 #ifndef _CONTENT_PACKAGE
-		__debugbreak();
+		DEBUG_BREAK();
 		//throw new RuntimeException("Already decorating!!");
 #endif
 	}