Revert "Get rid of MSVC's __int64"

This reverts commit d63f79325f.

Minecraft.World/CanyonFeature.h

@@ -9,6 +9,6 @@ private:
 	float rs[1024];
 
 protected:
-    void addTunnel(int64_t seed, int xOffs, int zOffs, byteArray blocks, double xCave, double yCave, double zCave, float thickness, float yRot, float xRot, int step, int dist, double yScale);
+    void addTunnel(__int64 seed, int xOffs, int zOffs, byteArray blocks, double xCave, double yCave, double zCave, float thickness, float yRot, float xRot, int step, int dist, double yScale);
     virtual void addFeature(Level *level, int x, int z, int xOffs, int zOffs, byteArray blocks);
 };